 Despite the success of "Freedom Blues", none of Penniman's other Reprise singles charted with the exception of "Greenwood, Mississippi", a swamp rock original by guitar hero, Travis Wammack, who incidentally played on the track.It charted only briefly on the "Billboard" Hot 100 and Cash Box pop chart, also on the "Billboard" Country charts; made a strong showing on WWRL in New York, before disappearing.Penniman became a featured guest instrumentalist and vocalist on recordings by acts such as Delaney and Bonnie, Joey Covington and Joe Walsh and was prominently featured on Canned Heat's 1972 hit single, "Rockin' with the King".