Cindy Birdsong did not hear Birdsong's voice on most of The Supremes' newest singles. Except for featured backgrounds on several collaborations with The Temptations, live album tracks, and some studio LP tracks, Birdsong and fellow member Mary Wilson did not sing backing vocals on the group's later singles. Session singers The Andantes substituted for Mary and Cindy on many, although not on all, cuts in subsequent Diana Ross & the Supremes albums. Both the "Let the Sunshine In" album and the "Cream of the Crop" album include tracks on which Florence Ballard, Mary Wilson and Cindy Birdsong sing back-up, often in tandem
Cindy Birdsong group found a hit with the ballad, "Down the Aisle (The Wedding Song)". Birdsong was noted for her high soprano vocals in the background. From 1963 until 1966, The Blue Belles, later Patti LaBelle and The Bluebelles, found relative success on the charts and were raved for their live performances. After first performing at the Apollo Theater in 1961, the group became regular headliners at the world-famous venue, earning the nickname, "The Sweethearts of the Apollo". Following the success of "Down the Aisle", the group had follow-up success with "You'll Never Walk Alone" and "Danny Boy" before leaving their second