Gnoosic - Even if you don't know what you are looking for - gnod will find it.
humit - A social networking app for music sharing and discovery.
Musicroamer - A visual Pandora for discovering new music
Songlink - Share music with anyone.
TasteDive - TasteDive recommends similar music (musicians, bands), movies, TV shows, books, authors and games, based on what you like.
Son.gg in Slack - Share music with your team in Slack