Sometimes record company's eliminate certain artists as they prefer to market the group the other way... Tony Orlando's group Dawn actually consisted of THREE female singers on their recordings and even tracks for their television show... Telma Hopkins, Joyce Vincent, and Pam Vincent [[Joyces sister and singing partner)...For touring and the television show...they decided to put just Telma and Joyce onstage, although sister Pam continued recording with the ensemble and Joyce and Pam still work together often today, while also doing individual projects... Probably just easier to work with two Dawns instead of three, or maybe Joyce and Telma were just a better fit for the routines they were dong on stage...