2010 two CD compilation. When Afro Celt Sound System burst onto the music scene some 15 years ago their impact was so instant, so astounding, that it hit like a thunder crack. Here was a band whose fusion of West African rhythms, Irish traditional music and cutting-edge dance grooves battered the senses and unleashed a wellspring of joy and liberation. Festival audiences did a double take then danced like dervishes. Albums flew off the shelves. There were Grammy nominations and big film soundtracks. They added diverse new touches - Indian bhangra, Arabic influences, dub reggae - in ways that enhanced their sound and emphasized their openness. The line-up expanded and evolved around four core members (Simon Emmerson, James McNally, Iarla O"Lionaird, Martin Russell). Afro Celt"s pan-global sound redefined dance music and stumped music critics. They remain defiantly, enigmatically uncategorizable.