I'm looking for a Halloween story that has Xander turned into a rapper. I can't remember the name of it though. It's a Spike and Buffy pairing this is all I remember.

Wish I could help you - first I've ever come across a Xander story that has him as a musician or entertainer. 

Is this by any stretch of the imagination it?

http://offline.buffy.de/outlink_en.php?module=/webserver/offline/www.bringonthebloodshed.com/bloodshedverse/fiction/inagaddadavida.htm

 Yes it was thankyou.