Bandlab - Capture, nurture, and collaborate on song ideas in the cloud
Songlio - Free musical guessing game: race friends to name that tune
Music Memos by Apple - An app to capture your song ideas
Rock On! - A song pop adventure - music trivia awesomeness
AIVA - The AI composing emotional soundtrack music
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.