This game looks interesting...a whole lot of music related games seem to be going free, but judging from the responses, they don't seem to be too popular on TA. App info is currently processing and/or the app is not yet fully available for sale on the US App Store.
I'm bumping this since it finally has gone free. This was wierd; I found out it went free (in Germany) about 12 hours early. It then disappeared from the on sale list, only to reappear later. The Dev must have accidentally scheduled the price drop early. Btw, all of this developer's apps are currently free. Also, this game is found in the "music" section of the app store, NOT the games section.