<Li> Billy Dee Williams </Li> <P> The Jeffersons had many two - part episodes, either over two consecutive weeks, or aired as an hour - long episode . </P> <P> Ja'net Dubois (from Good Times) and Jeff Barry co-wrote The Jeffersons theme song, "Movin' on Up", which was sung by Dubois with a gospel choir . The song was covered by Sammy Davis, Jr., in 1978 . </P> <P> The Jeffersons changed time slots at least 15 different times during its 11 - year run, unusual for a popular long running series . The most common time slot was on Sunday night . </P>

Who sings movin on up on the jeffersons