Shut Your Mouth.

Richard Roundtree's 1972 foray into the world of singing would probably have been laughable, were it not for the presence of genius producer and co-writer Eugene McDaniels—the man responsible for Roberta Flack's "Feel Like Makin' Love" and a ton of great work with Les McCann, Nancy Wilson, Jimmy Smith, Universal Jones, Bobby Hutcherson and others, as well as his own classics Outlaw and Headless Heroes of the Apocalypse.

Here's the best cut:
Richard Roundtree Lovin' MP3