the name of the tracks on the promo cd from Audio Rehab mixed by Jaxx?

My friend lent me a promo cd advertising Audio Rehab in Greenwich. It
was mixed by Jaxx and the first track at least, is really good (imho).
The first track lasts 6.20 mins with the lyrics coming in at 2.00
mins.
"We came here to party
Join together everybody
Lets celebrate
It's a holiday"
What is the name of the track?? and who's it by??
( If anyone gets this right I'll be very, very surprised . . and no,
it's not Madonna!)