Songlio - Free musical guessing game: race friends to name that tune
Groovebox: Beat & Synth Studio - Make Music & Play Instruments
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.
Scratch Track - Scratch Track is a simple and powerful application that offers services as a recording app to capture song ideas.
SongPop - The world's biggest music trivia game. Now even better.
BeatStyle - A mobile recording studio!