“Keeping Time: The Life, Music & Photographs of Milt Hinton” is both a tribute to the bass legend and a snapshot history of jazz. Hinton (1910-2000) took pictures throughout his 60-year career, but this hour focuses on his life on the road with Cab Calloway's band in the '30s and '40s, and his New York studio sessions in the '50s and '60s. Hinton was a “consummate musician,” says poet Amiri Baraka. And when he was playing, says bassist Eddie Gomez, “You [got] kind of a history lesson of jazz.”