When were the group, that provided vocals for 1974 hit TSOP, originally formed ?
TSOP (The Sound of Philadelphia): "TSOP (The Sound of Philadelphia)" is a 1974 hit recording by MFSB (Mother, Father, Sister, Brother) featuring vocals by The Three Degrees. The Three Degrees: The Three Degrees are an American female vocal group, who were originally formed in 1963 in Philadelphia, Pennsylvania.
1963