These people sent me an email offering me a free track by these people. Which was good. So good in fact that I bought their album, which is fantastic. It has that whole Palestrina crossed with Django Reinhardt thing, with occasional touches of Miles Davis and the Brighouse and Rastrick Brass Band. Genre-busting indeed.
This is the only video I could find of them. Being a live recording, some of the subtleties of the choir is lost, but there is some good audio on the group's website (click "music" on the menu bar). Funky choral singing. Who knew such a thing was possible?