I was watching a cover of DJ Asbha's solo on the 'tube. And the uploader gave the link for the backing track he used. I downloaded it and it sounds pretty swish.
It's about 3 and a half minutes long and is in the key of C# minor (in standard tuning) or D minor (in Eb tuning).
http://www.megaupload.com/?d=YILEUUMWEnjoy