this is fred de sam lazaro in ghana. >> that's our program for now. i'm bob abernathy. you can follow us on twitter and facebook. you can watch us any time on smartphones. there's also more on our website. audio and video podcasts are available. join us at pbs.org. as we leave you this martin luther king jr. weekend, music from the boys choir of harlem. ♪ ♪ ♪ ♪