Premise: The Supremes were an American female singing group and the premier act of Motown Records during the 1960s . Founded as the Primettes in Detroit , Michigan , in 1959 , the Supremes were the most commercially successful of Motown 's acts and are , to date , America 's most successful vocal group with 12 number one singles on the Billboard Hot 100 . Ross left to pursue a solo career in 1970 and was replaced by Jean Terrell , at which point the group 's name reverted to the Supremes .
Hypothesis: The Supremes were a group.
Label: ENTAILMENT