I was reading my Twitter feed a few minutes ago and saw this tweet from @wmcraver: This app reminds me of something @imogenheap would use...http://bit.ly/9T0hPJ Pretty amazing!
I haven't messed with the app at all (yet), but thenextweb.com (the site the video came from) says that it has a "fairly steep learning curve" i.e. I should probably never touch it. Regardless, this video is awesome and really shows off the iPhone's ability as a music device. Enjoy!