“Walk on By: The Story of Popular Song” was a BBC documentary in 8 or 10 parts that was — I think — alternatively titled “Popular Soundtrack of the Century” in the U.S. I had it saved on a DVR in ~2006, but that’s long gone. It’s in pieces on Youtube now, but they sometimes get yanked down. It covered multiple eras of popular Western music in the 20th century, from big band, to the interesting era of countrified-blues, all the way to the Monkees and boy bands. I loved watching and rewatching it. Lots of great interviews.