It's not as uncommon as you might think. Just off...

2008-01-21T13:13:00.000+09:00

It's not as uncommon as you might think. Just off the top of my head, Ryan Adams and The Mars Volta do something like this. If you listen to any of Adams' growing collection of bootlegs, you'll notice the evolution his songs undergo over time.

The Mars Volta is also well known for jamming out all of their songs live. They also have a permanent member of their live band whose primary job is sound manipulation. You can imagine the potential that has.

Both artists put out a lot of material and tour regularly.

This is something a lot of artists are not apt to do, though, because they aren't good at improvisation, don't like the energy improvisation takes or are afraid of alienating the fickle fan base that many pop artists attract. Besides, while it's fun to see bands do this, if too many bands did it it'd probably get tiresome.

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It's not as uncommon as you might think. Just off...