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: Sedaka's Back is a compilation album by American singer-songwriter Neil Sedaka. 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: The Carpenters were an American vocal and instrumental duo consisting of siblings Karen (1950-1983) and Richard Carpenter (b. 1946). The Carpenters:  During their 14-year career, the Carpenters recorded 11 albums, 31 singles, five television specials, and a short-lived television series.
11