Not sure this counts as obscure music, but I'd probably include it in "diverse sounds" - either way, it's my first post here, be kind and Gimme feedback!
http://philspector.wordpress.com/2008/07/08/gimme-shelter-gimme-gimme-gimme/
Available here is a 9.4MB download of Mick Jagger and Merry Clayton getting some vocals down... "double tracked vocal-only performance. Just Jagger and Clayton battling it out.". It's awesome, haunting and powerful and other words like that.
Hope it's of interest... Enjoy!
SeasideMan
Pro 
That was interesting to hear, thanks for it. I particularly enjoyed being able to isolate the guitar parts!
Tom.