BeatStyle - A mobile recording studio!
Auxy Music Studio - Auxy brings real music creation to iPhone in a simple and inspiring format.
VOXISO - Online AI-powered vocal and music remover
Sampulator - Make (and record) beats on your keyboard
Groovebox: Beat & Synth Studio - Make Music & Play Instruments
Ramsophone - A generative art/music machine. (Be sure to refresh!)