Sedaka's Back is a compilation album that included songs that were turned into hits by other artists such as "Solitaire" by an American vocal and instrumental duo that recorded how many albums?   
Sedaka's Back:  Also included were songs that were turned into hits by other artists: "Solitaire" (The Carpenters) and "Love Will Keep Us Together" (The Captain & Tennille). The Carpenters:  During their 14-year career, the Carpenters recorded 11 albums, 31 singles, five television specials, and a short-lived television series.
i don't know