Songlio - Free musical guessing game: race friends to name that tune
Poolside FM - Experiment a radio made on Internet times.
SongTrivia2.io - Songtrivia2.io is a browser and mobile blind test game that allows you to play in real time with your friends or against strangers. Several musical themes, difficulty and game modes are available to create lots of different musical quizzes.
Noted - Social music discovery
Fretello Stage - Jam, record and share your music in the blink of an eye
humit - A social networking app for music sharing and discovery.