Auxy Music Studio - Auxy brings real music creation to iPhone in a simple and inspiring format.
Spotify - Map shows when two people play same song at same time
nlog Synth - Professional Virtual Analogue Synthesizer ::: check nlogmusic at YouTube :::
Last.fm - The world's largest online music service. Listen online, find out more about your favourite artists, and get music recommendations, only at Last.fm
cassini - Polyphonic Synthesizer for iPhone/iPod touch
SoundCloud - Enjoy music & follow favourite artists