Yeah, ask them. I was at a performance in a tourist venue a couple of years ago, here in Ireland, and the singers were doing all the songs we know and love. There were a couple of very glum Americans sitting there. Then they launched into some of the Irish-American stuff - "If You're Irish, Come Into the Parlour" and things - and they really cheered up. The familiar is loved.

And it's a graceful homage to your audience to play the songs of their particular culture. I wonder if there's an African-American old people's association who'd help you with information about what songs were popular with their people when they were young?