Last week I was in Costa Rica, and I heard music which sounded like a choral group singing old church music with occasional interludes by Jimi Hendrix.

Our waiter said it was a band, and he gave a name which sounded like 'Ay-la.'

I don't pay any attention to popular music, and for all I know, this is one of the top bands in the world. Can anybody tell me their correct name and something about their music?