Wedding Crashers

Does anyone know the song that is in the opening credits of Wedding Crashers. It plays just as they finish the beginning scene with the divorce and begin the intro credits. It's a face paced song that sounds like it is sung by a quartet. The song is pretty repepetitive.

Was it anything like this?

Amazon.co.uk : Music Sampler

Track #31 was the nearest I could find but it should be this I think:

Horn Concerto No. 4 in E Flat Minor - Swingle Singers