[Afropop] Taj Mahal and Keb Mo have been fellow travelers on the road that leads from American blues, back to Africa, and home again. So it's natural that they would team up for an album and a tour. Their just-released album Room on the Porch is something of a return to roots, a set of ten down-home tracks ranging from funky, gut-bucket blues ("Junkyard Dog") to soulful swing ("She Keeps Me Movin") to love songs that tug at the heartstrings ("My Darling My Dear) and the title track with its sing-along invitation to