Sprint Center (sprintcenter.com/) is a large, multi-use indoor arena in downtown Kansas City, Missouri. They hold pretty big concerts such as Coldplay, Britney Spears etc.
This installation has 3 applications; Phone Painter, Now Widgets, and Instant DJ. All you have to do is just call the number on display and play by speaking or pressing the keys. It will even send you a text with a link to the song you composed, art you drew after you hang up. Although I was using my iPhone on the demo, it works with any phones of any carriers! (It doesn’t have to be Sprint phones or any smart phones.)

Screen shot of each application
Phone Painter: vimeo.com/4737618
Instant DJ: vimeo.com/4737491
Now Widget: vimeo.com/4737976

Official documentation video is on its way but here is a demo video that I shot with my digital camera.

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