It retrieves audio, video and metadata from various Internet sources, such as:

Last.FM
VK
Odnoklassniki
Yandex Music
Spotify
Bandcamp
Deezer
SoundCloud
YouTube Music
YouTube
Discogs
Genius
MusixMatch
MusicBrainz

Features

absolutely free
no ads
no login (but required for certain features)
listening (artists / albums / tracks) (+ offline) (+ equalizer)
artists (tracks / albums / similar / shows)
albums
tracks (similar / albums)
tags (artists / albums / tracks)
queue (+ shuffle / loop) (+ albums adding)
music library (+ import from account) (+ compatibility)
music services integration (Last.FM, Spotify)
recommendations (artists / tracks) (based on your library) (+ filters)
search (artists / albums / album groups / tracks / lyrics / tags / videos / video channels / video playlists) (through all of the sources above)
radio (tags / artists / top)
scrobbling (Last.FM)
Discord Rich Presence (+ buttons customization)
videos (+ related / channels / playlists) (YouTube, YouTube Music)
lyrics (+ annotations) (Genius, MusixMatch)
top (artists / albums / tracks / tags) (+ country select)
new / upcoming releases
multitag search (artists / albums)
external links (artists / albums / tracks / videos / video channels / video playlists)
playlists (+ import from account) (+ album / queue adding)
favorites (artists / albums / tracks / videos) (+ import from account)
bookmarks (artists / albums / tracks / videos / video channels / video playlists)
listened (artists / albums / tracks)
watched (videos)
posting (+ comments)
following
messaging
feed (+ global)
communities
sharing (artists / albums / tracks / videos / video channels / video playlists / playlists / communities)
theming (dark mode / background / transparency)
history (activity / player / browser)