Rockmate (ipad, music) on sale for 99 cents.
You might have seen this in Apple commercials.
If you have friends, this is one of the most fun music apps, period. I have it, it's like a 4 man band in your hand. Everything is super proffessional, graphics are great, you can record, there are stompboxes, everything. It's a great go-to app when you have music inclined company. Three long time friends of mine, all professional drummers who still live in the Miami-Ft. Lauderdale area, came over recently and we were acting like 4 year olds with this app...nearly broke the glass on my ipad mini.