The Three Degrees is an American female vocal group formed circa 1963 in Philadelphia, Pennsylvania. Although 16 women have been members over the years, the group has always been a trio. The current line-up consists of Valerie Holiday, Freddi Poole, and Jessie Wagner. The group were particularly successful in the UK, achieving 13 Top 50 hit singles between 1974 and 1985.

"TSOP (The Sound of Philadelphia)" is a 1974 recording by MFSB featuring vocals by The Three Degrees. It was written by Gamble and Huff as the theme for the American musical television program Soul Train, which specialized in African American musical performers. The single was released on the Philadelphia International Records label. It was the first television theme song to reach No. 1 on the Billboard Hot 100.