Polychord (App Store link) is an $9.99 iPad musical instrument designed to be easy to play, in the tradition of the autoharp or OmniChord:
Polychord is drums, bass, chords, and accompaniment all wrapped into one. Simply press one of the chord circles and your on your way to writing a song. Drums and bass follow the chords automatically, but the coolest part is probably the strum keys on the right: simply swipe your finger over the yellow keys to strum a chord.
Unfortunately, the company doesn’t provide specs for the app. WireToTheEar’s Oliver Chesler has a short review of it, though, saying “If they get this App working with Midi/external sounds it’s going to be drop dead essential.”
If you’ve used Polychord, leave a comment and let us know what you think of it!