I'm sure Mr. Scruff sampeled from somewhere else. Sounds like old school big band music. but here is the song + a cool video none the less
http://www.ilike.com/artist/Mr.+Scruff/track/Get+A+Move+On
Its such a perfect entrance song, I love it. The band comes out, the song hits its crescendo, Jim's back is to the crowd and he starts jumping up and down...gets me every time :D
it's by moondog and the song is "bird's lament".
http://www.youtube.com/watch?v=4kZU0RXxsxI
dude is a NYC street legend:
http://en.wikipedia.org/wiki/Moondog