Songlio - Free musical guessing game: race friends to name that tune
ReSlice - Slice your audio with an advanced, rhythmic arpeggiator and FX.
Rock On! - A song pop adventure - music trivia awesomeness
cassini - Polyphonic Synthesizer for iPhone/iPod touch
Stugo - StuGo™ is a one-stop-shop for all your studio needs.
nlog Synth - Professional Virtual Analogue Synthesizer ::: check nlogmusic at YouTube :::