Fingerlab the makers of one of the best iOS drum machines the DM-1 has released Musyc. I love pretty object and physics based touch sequencers. Others include synthPond, Soundrop, Aura Flux, Reactable and SoundyThingie to name a few. Musyc is really slick and if you’re into music at all a real joy! It’s free with in app purchases.
“Musyc is a fun and innovative music application where touch turns into music. No use of piano keyboard or partitions, draw shapes and listen to your piece of music while viewing sounds bouncing on the screen.” – fingerlab.net
For more info: fingerlab.net