Khush makes LaDiDa. Interesting concept for a computer music app. It works on iPhone and generates music to match what you sing.
Khush was a 500 Startups startup. LaDiDa was "the top free music app on iTunes after it launched."
Khu.sh apps may have 50 million users. according to an article I read on the Net.
Khush means happy in Hindi :)