diff --git a/README.md b/README.md
index 82a56945..fc5600d2 100644
--- a/README.md
+++ b/README.md
@@ -9,7 +9,8 @@ A [demo instance](http://lms-demo.poupon.dev) is available. Note the administrat
 ## Main features
 * Recommendation engine
 * Audio transcode for maximum interoperability and low bandwith requirements
-* Multi-value tags: `artist`, `genre`, `composer`, `lyricist`, `mood`, `performer`, ...
+* Multi-value tags: `genre`, `albumgenre`, `mood`, `albummood`, `albumgrouping`, ...
+* Artist relationships: `composer`, `conductor`, `lyricist`, `mixer`, `performer`, `producer`, `remixer`
 * [MusicBrainz Identifier](https://musicbrainz.org/doc/MusicBrainz_Identifier) support to handle duplicated artist and release names
 * [ListenBrainz](https://listenbrainz.org) support for:
   * Scrobbling and synchronizing listens
@@ -22,7 +23,7 @@ A [demo instance](http://lms-demo.poupon.dev) is available. Note the administrat
 _LMS_ provides several ways to help you find the music you like:
 * Tag-based filters (ex: _Rock_, _Metal_ and _Aggressive_, _Electronic_ and _Relaxed_, ...)
 * Recommendations for similar artists and albums
-* Radio mode, based on what is in the current playqueue
+* Radio mode, with endless filling of the play queue with tracks similar to what is there
 * Searches in album, artist and track names (including sort names)
 * Starred Albums/Artists/Tracks
 * Various tags to help you filter your music: _mood_, _albummood_, _albumgenre_, _albumgrouping_, ...
@@ -33,17 +34,8 @@ _LMS_ provides several ways to help you find the music you like:
   * Starred _Jazz_ albums
   * ...
 
-The recommendation engine uses two different sources:
-1. Tags that are present in the audio files
-2. Acoustic similarities of the audio files, using a trained [Self-Organizing Map](https://en.wikipedia.org/wiki/Self-organizing_map)
-
-__Notes on the self-organizing map__:
-* training the map requires significant computation time on large collections (ex: half an hour for 40k tracks using a Core i5)
-* audio acoustic data is pulled from [AcousticBrainz](https://acousticbrainz.org/). Therefore your audio files _must_ contain the [recording](https://musicbrainz.org/doc/Recording) [MusicBrainz Identifier](https://musicbrainz.org/doc/MusicBrainz_Identifier).
-* to enable the audio similarity source, you have to enable it first in the administration panel.
-
 ## Subsonic API
-The API version implemented is 1.16.0 and has been tested on _Android_ using _Subsonic Player_, _Ultrasonic_ and _DSub_.
+The API version implemented is 1.16.0 and has been tested on _Android_ using _Subsonic Player_, _Ultrasonic_, _Symfonium_, and _DSub_.
 Since _LMS_ uses metadata tags to organize music, a compatibility mode is used to browse the collection when using the directory browsing commands.
 The Subsonic API is enabled by default.
 
@@ -53,9 +45,11 @@ __Note__: since _LMS_ may store hashed and salted passwords or may forward authe
 _LMS_ relies exclusively on tags to organize your music collection.
 
 ### Filtering
-You can specify the tags you want to be used to filter your collection. By default, `GENRE`, `ALBUMGROUPING`, `MOOD` and `ALBUMMOOD` tags are used.
+You can specify the tags you want to use to filter your collection. By default, `genre`, `albumgrouping`, `mood` and `albummood` tags are used.
 In the administration  panel, you can set whatever tags you want, even custom tags.
 
+__Note__: you can use the `lms-metadata` tool to have an idea of the tags parsed by _LMS_ using [TagLib](https://github.com/taglib/taglib).
+
 ### Multiple album artists
 _LMS_ requires the `ALBUMARTISTS` and `ALBUMARTISTSSORT` tags to properly handle multiple album artists on the same album. As they are a custom tags, you may need to setup your favorite tagger to add them.
 
diff --git a/approot/admin-database.xml b/approot/admin-database.xml
index 857b6611..df1f883e 100644
--- a/approot/admin-database.xml
+++ b/approot/admin-database.xml
@@ -34,6 +34,7 @@
 			</div>
 		</div>
 		<legend>${tr:Lms.Admin.Database.scan-options}</legend>
+		${<if-has-recommendation-engine>}
 		<div class="col-lg-6">
 			<label class="form-label" for="${id:recommendation-engine-type}">
 				${tr:Lms.Admin.Database.recommendation-engine-type}
@@ -43,6 +44,7 @@
 				${recommendation-engine-type-info}
 			</div>
 		</div>
+		${</if-has-recommendation-engine>}
 		<div class="col-12">
 			<label class="form-label" for="${id:clusters}">
 				${tr:Lms.clusters}
diff --git a/src/libs/services/scanner/CMakeLists.txt b/src/libs/services/scanner/CMakeLists.txt
index 9aefadd2..53f65df3 100644
--- a/src/libs/services/scanner/CMakeLists.txt
+++ b/src/libs/services/scanner/CMakeLists.txt
@@ -1,6 +1,5 @@
 
 add_library(lmsscanner SHARED
-	impl/AcousticBrainzUtils.cpp
 	impl/ScannerService.cpp
 	impl/ScannerStats.cpp
 	)
diff --git a/src/libs/services/scanner/impl/AcousticBrainzUtils.cpp b/src/libs/services/scanner/impl/AcousticBrainzUtils.cpp
deleted file mode 100644
index ba1a3a66..00000000
--- a/src/libs/services/scanner/impl/AcousticBrainzUtils.cpp
+++ /dev/null
@@ -1,87 +0,0 @@
-/*
- * Copyright (C) 2018 Emeric Poupon
- *
- * This file is part of LMS.
- *
- * LMS is free software: you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation, either version 3 of the License, or
- * (at your option) any later version.
- *
- * LMS is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with LMS.  If not, see <http://www.gnu.org/licenses/>.
- */
-
-#include "AcousticBrainzUtils.hpp"
-
-#include <boost/property_tree/ptree.hpp>
-#include <boost/property_tree/json_parser.hpp>
-
-#include <Wt/WIOService.h>
-#include <Wt/Http/Client.h>
-
-#include "utils/IConfig.hpp"
-#include "utils/Logger.hpp"
-#include "utils/Service.hpp"
-#include "utils/UUID.hpp"
-
-
-namespace AcousticBrainz
-{
-
-static
-std::string
-getJsonData(const UUID& mbid)
-{
-	static constexpr std::string_view defaultAPIURL {"https://acousticbrainz.org"};
-
-	const std::string url {std::string {Service<IConfig>::get()->getString("acousticbrainz-api-base-url", defaultAPIURL)} + "/api/v1/" + std::string {mbid.getAsString()} + "/low-level"};
-
-	boost::asio::io_service ioService;
-
-	Wt::Http::Client client {ioService};
-	client.setFollowRedirect(true);
-	client.setSslCertificateVerificationEnabled(true);
-	client.setMaximumResponseSize(256*1024);
-
-	if (!client.get(url))
-	{
-		LMS_LOG(DBUPDATER, ERROR) << "Cannot perform a GET request to url '" << url << "'";
-		return {};
-	}
-
-	std::string response;
-	client.done().connect([&](Wt::AsioWrapper::error_code ec, const Wt::Http::Message &msg)
-	{
-		if (ec)
-		{
-			LMS_LOG(DBUPDATER, ERROR) << "GET request to url '" << url << "' failed: " << ec.message();
-			return;
-		}
-
-		if (msg.status() != 200)
-		{
-			LMS_LOG(DBUPDATER, ERROR) << "GET request to url '" << url << "' failed: status = " << msg.status() << ", body = " << msg.body();
-			return;
-		}
-
-		response = msg.body();
-	});
-
-	ioService.run();
-
-	return response;
-}
-
-std::string
-extractLowLevelFeatures(const UUID& recordingMBID)
-{
-	return getJsonData(recordingMBID);
-}
-
-} // namespace Scanner::AcousticBrainz
diff --git a/src/libs/services/scanner/impl/AcousticBrainzUtils.hpp b/src/libs/services/scanner/impl/AcousticBrainzUtils.hpp
deleted file mode 100644
index 07787d59..00000000
--- a/src/libs/services/scanner/impl/AcousticBrainzUtils.hpp
+++ /dev/null
@@ -1,30 +0,0 @@
-/*
- * Copyright (C) 2018 Emeric Poupon
- *
- * This file is part of LMS.
- *
- * LMS is free software: you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation, either version 3 of the License, or
- * (at your option) any later version.
- *
- * LMS is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with LMS.  If not, see <http://www.gnu.org/licenses/>.
- */
-
-#pragma once
-
-#include <string>
-
-class UUID;
-
-namespace AcousticBrainz
-{
-	std::string extractLowLevelFeatures(const UUID& recordingMBID);
-}
-
diff --git a/src/libs/services/scanner/impl/ScannerService.cpp b/src/libs/services/scanner/impl/ScannerService.cpp
index 2a170fa6..d63c2826 100644
--- a/src/libs/services/scanner/impl/ScannerService.cpp
+++ b/src/libs/services/scanner/impl/ScannerService.cpp
@@ -38,7 +38,6 @@
 #include "utils/Logger.hpp"
 #include "utils/Path.hpp"
 #include "utils/UUID.hpp"
-#include "AcousticBrainzUtils.hpp"
 
 using namespace Database;
 
@@ -526,7 +525,6 @@ ScannerService::scan(bool forceScan)
 	if (!_abortScan)
 	{
 		checkDuplicatedAudioFiles(stats);
-		fetchTrackFeatures(stats);
 		reloadSimilarityEngine(stats);
 	}
 
@@ -560,85 +558,6 @@ ScannerService::scan(bool forceScan)
 	}
 }
 
-bool
-ScannerService::fetchTrackFeatures(TrackId trackId, const UUID& recordingMBID)
-{
-	std::map<std::string, double> features;
-
-	LMS_LOG(DBUPDATER, INFO) << "Fetching low level features for recording '" << recordingMBID.getAsString() << "'";
-	const std::string data {AcousticBrainz::extractLowLevelFeatures(recordingMBID)};
-	if (data.empty())
-	{
-		LMS_LOG(DBUPDATER, ERROR) << "Track " << trackId.getValue() << ", recording MBID = '" << recordingMBID.getAsString() << "': cannot extract features using AcousticBrainz";
-		return false;
-	}
-
-	{
-		auto uniqueTransaction {_dbSession.createUniqueTransaction()};
-
-		Track::pointer track {Track::find(_dbSession, trackId)};
-		if (!track)
-			return false;
-
-		_dbSession.create<TrackFeatures>(track, data);
-	}
-
-	return true;
-}
-
-void
-ScannerService::fetchTrackFeatures(ScanStats& stats)
-{
-	if (_recommendationServiceType != ScanSettings::RecommendationEngineType::Features)
-		return;
-
-	ScanStepStats stepStats{stats.startTime, ScanProgressStep::FetchingTrackFeatures};
-
-	LMS_LOG(DBUPDATER, INFO) << "Fetching missing track features...";
-
-	struct TrackInfo
-	{
-		TrackId id;
-		UUID recordingMBID;
-	};
-
-	const auto tracksToFetch {[&]()
-	{
-		std::vector<TrackInfo> res;
-
-		auto transaction {_dbSession.createSharedTransaction()};
-
-		auto trackIds {Track::findWithRecordingMBIDAndMissingFeatures(_dbSession, Range {})};
-		for (const TrackId trackId : trackIds.results)
-		{
-			const Track::pointer track {Track::find(_dbSession, trackId)};
-			res.emplace_back(TrackInfo {track->getId(), *track->getRecordingMBID()});
-		}
-
-		return res;
-	}()};
-
-	stepStats.totalElems = tracksToFetch.size();
-	notifyInProgress(stepStats);
-
-	LMS_LOG(DBUPDATER, INFO) << "Found " << tracksToFetch.size() << " track(s) to fetch!";
-
-	for (const TrackInfo& trackToFetch : tracksToFetch)
-	{
-		if (_abortScan)
-			return;
-
-		if (fetchTrackFeatures(trackToFetch.id, trackToFetch.recordingMBID))
-			stats.featuresFetched++;
-
-		stepStats.processedElems++;
-		notifyInProgressIfNeeded(stepStats);
-	}
-
-	notifyInProgress(stepStats);
-	LMS_LOG(DBUPDATER, INFO) << "Track features fetched!";
-}
-
 void
 ScannerService::refreshScanSettings()
 {
diff --git a/src/libs/services/scanner/impl/ScannerService.hpp b/src/libs/services/scanner/impl/ScannerService.hpp
index 9614bcb9..9e7ec5ea 100644
--- a/src/libs/services/scanner/impl/ScannerService.hpp
+++ b/src/libs/services/scanner/impl/ScannerService.hpp
@@ -77,8 +77,6 @@ namespace Scanner
 			void scan(bool force);
 
 			void scanMediaDirectory( const std::filesystem::path& mediaDirectory, bool forceScan, ScanStats& stats);
-			bool fetchTrackFeatures(Database::TrackId trackId, const UUID& MBID);
-			void fetchTrackFeatures(ScanStats& stats);
 
 			// Helpers
 			void refreshScanSettings();
diff --git a/src/lms/ui/admin/DatabaseSettingsView.cpp b/src/lms/ui/admin/DatabaseSettingsView.cpp
index 9436de4f..97635cd4 100644
--- a/src/lms/ui/admin/DatabaseSettingsView.cpp
+++ b/src/lms/ui/admin/DatabaseSettingsView.cpp
@@ -142,6 +142,13 @@ class DatabaseSettingsModel : public Wt::WFormModel
 			scanSettings.modify()->setClusterTypes(LmsApp->getDbSession(), std::set<std::string>(clusterTypes.begin(), clusterTypes.end()));
 		}
 
+		static ScanSettings::RecommendationEngineType getCurrentRecommendationEngine()
+		{
+			auto transaction {LmsApp->getDbSession().createSharedTransaction()};
+			const ScanSettings::pointer scanSettings {ScanSettings::get(LmsApp->getDbSession())};
+			return scanSettings->getRecommendationEngineType();
+		}
+
 	private:
 		void initializeModels()
 		{
@@ -211,6 +218,9 @@ DatabaseSettingsView::refreshView()
 	t->setFormWidget(DatabaseSettingsModel::UpdateStartTimeField, std::move(updateStartTime));
 
 	// recommendation engine type
+	// Hide the settings if the engine is set to clusters, as we don't want users to switch to acoustic features (currently broken)
+	// Otherwise, give the user a way to switch back to clusters
+	t->setCondition("if-has-recommendation-engine", model->getCurrentRecommendationEngine() == ScanSettings::RecommendationEngineType::Features);
 	auto recommendationEngineType {std::make_unique<Wt::WComboBox>()};
 	recommendationEngineType->setModel(model->recommendationEngineTypeModel());
 	t->setFormWidget(DatabaseSettingsModel::RecommendationEngineTypeField, std::move(recommendationEngineType));