In recreating Katy Perry's infectious pop classic, Yuri Wong demonstrates the simple power of GarageBand for the iPad. Nice work Yuri! Here's a breakdown of the instruments used:

• Hard Rock (Guitar)
• Hip Hop Drum Machine
• Fuel Cells (Keyboard)
• Acoustic (Guitar)
• Sync Lead (Keyboard)
• Liverpool (Bass)
• Chill Pad (Keyboard)
• Supergroup Lead (Keyboard)

Though we are really excited about getting our hands on the iPad 2 hardware, we have to admit that GarageBand, which don't forget runs perfectly on the original iPad, is first becoming the true star of Steve Job's recent stage appearance.

We'll bring you more iPad GarageBand tunes as we find them.