I was introduced to Pet Sounds in the Key of Dee today (http://www.youtube.com/watch?feature=player_embedded&v=zo0ur0U-TUM) and it's ace.

I'm quite keen to listen to similar stuff. I've listened to the Grey Album and Jaydiohead Jay-Z things but not much beyond that.

I'm probably more inclined towards stuff like the Pet Sounds one which turns the source material into something utterly different but more straightforward mash-ups like the aforementioned Grey Album are grand too.