digi-sheet - Musicians digital tablet with a variety of innovative applications such as, auto-scrolling music, "sound-check"(much like spell check but for sound), community applications, and a wide variety of other problem solving solutions that many musicians have come by while playing, learning, practicing, and performing.
( I played the violin and in orchestras for 15+ years, hence knew what simple problems were needed that only a user would understand.)
more at:
www.aarontang.net/design