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[ButterCookie]

That's a really good question, I wish I knew. I've seen it done before, most noteably with an early Blondie Demo I recently got hold of (The keyboard player, Jimmy Destri, does the lead vocals instead of Debbie Harry). My guess would be to see how they soud or just for fun? Don't hold me to that though, I'm sure someone else could give you a properly valid reason