Nine Inch Nails’ “Hurt” played on my iPhone instrument VocaForm and acoustic guitar. There is one guitar track, everything else is played on an iPod Touch.
Audio recorded with a PreSonus Firepod and Garageband. Video recorded with a Canon T1i and a Panasonic Lumix DMC-TZ5. Edited in Final Cut Pro.
More info: https://timbolstad.wordpress.com/vocaform
iTunes Link: http://itunes.com/apps/VocaForm
Tim Bolstad 
very cool – are you taking requests yet? (smile)