Today I was in Rundle mall; and I saw a busker with a drum machine. He had a pretty decent setup, and a funny shaped guitar - obviously; it's not a guitar, but that's the easiest description for it.
He'd tap away; and the drum machine would pick up a rhythm; then he'd chime in with his music.
It was good enough to have people walk up; pull out their earplugs and start to tap their feet; dance a little even.
One lady with her ipod tips a few $ and wanders off.
I found myself wondering: why does her experience of this music have to stop there? How hard would it be to have the busker give her a copy of his music right there and then? What if the busker had a Really Cheap Device that let him record to MP3 and transfer that to a USB device.
Certainly the busker would solicit more donations; because if you are face to face with someone and getting their music; you are far more likely to put your hand in your pocket.
There's also no issues with trusting money over the internet; or DRM; or any of that junk.