Questlove's documentary, Ladies & Gentlemen... 50 Years of SNL Music, airs tonight on NBC. It highlights some of the show's most iconic musical performances and comedy sketches — from break-out stars to lip-syncing controversy. Our TV critic David Bianculli reflects on the documentary, and then Questlove joins Terry Gross to talk about some of the highlights.

Also, Ken Tucker reviews Ringo Starr's new country album, Look Up.