Free for 72hrs, normal price fluctuates between $1.29 and $3.79. Was last free 2 years ago.
Synopsis from app description:
Rockmate have been featured on Apple iPad TV ads.
Rockmate turns your iPad into a complete music studio that is easy and super fun to use.
You can compose, record and play songs with up to 4 Rock players on a single iPad. Rockmate is easy to play with smart chord progressions, sounds great with separate guitar effects and audio samples produced in-house, and is also fully customizable with multiple drums and keyboard styles.
reminded me of the simon says game