Gnoosic - Even if you don't know what you are looking for - gnod will find it.
Musish - A web client for Apple Music
Musicroamer - A visual Pandora for discovering new music
Apple Music - Apple Music app combines your personal iTunes library with Apple's music subscription service. Music you have purchased from the iTunes store, or synced over from other sources, is available in the "Library" tab. Read more about Apple Music.
TasteDive - TasteDive recommends similar music (musicians, bands), movies, TV shows, books, authors and games, based on what you like.
Apple Music Web App - Apple Music is now available to stream on the web