http://www.youtube.com/watch?v=DdaFfbNXej8

MilkyApps’ BeatBox Live (App Store link) is a $2.99 drum pad music application that lets you play your own drum patterns and also play over original urban/pop/rock music.

BeatBox Live includes 6 different drum kits and 12 original soundtracks. 

Kits Include:

• Beatbox Drums (Vocal Beats)
• 808 Drums
• Latin Drums
• Hip-Hop Drums
• Indie Drums
• Euro/Dance Drums