"Garage Band-Like" App for Android?

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http://androidforums.com – Hey so I'm really wanting a Nexus 7, but I really want a music app like garage band. I would almost consider an iPad Mini solely for Garage Band. It's so much fun, and as a musician, I can compose a small song or riff and maybe use it later. Plus its fast and easy. Is there anything that compares to it for Android tablet? Something with Guitar (Acoustic+Electric), Drums, Mic, Bass, Piano/Synth? I think I've heard of some apps with just a drum looping track and a synth board, but I think I'd want more. (General)