OKA is an Australian music band. As they say, the OKA sound is deeply rooted in the laid back coastal style of their country.
I always liked the didgeridoo. OKA's ambiant chillaxed sound and tempo are awesome. Listen at 4:11 when DidgeriStu restart the didgeridoo, you can hear a few people scream. I didn't since I was recording. ;-)
More information at http://oka-band.com and/or http://www.facebook.com/okamusic