The concept of music phone changed for good when KDDI first introduced its conceptual designs, handsets that can be used as musical instruments. You’ve got a guitar-phone, a flute-phone and a synthetiser-phone, all of them with the usual shapes and sizes, nothing special.
Here’s the Yamaha Mobile Orchestra playing their hearts out by using the musical instrument-phones. The first video is a classic piece, followed by the Mario OST and a great alternative tune:
[via Concept Phones]