http://www.rathergood.com/
It was a commercial for VH1 and it had the kittens playing there instruments and everyhting. (VH1 is a music channel, Just in case you dont have it there in the UK)
I can't believe you posted this today....just last night I looked up the following link because my kids remembered it from last summer!! http://www.rathergood.com/independent_woman/