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Examples of when bands make a song totally unlike the rest of their output
Self explanatory I think
I think my favourite example of this is 'Make Me Moo' by avant garde group 'The Residents', it's basically a twee indie pop song and the is no other way of putting it, a very good one though.
http://www.youtube.com/watch?v=iQyVJpO3IVk
More please