The Supremes were an American girl group formed in Detroit, Michigan, in 1959 as the Primettes. The premier act of Motown Records during the 1960s, the Supremes were the most commercially successful of Motown's acts and the most successful American vocal group, with twelve number 1 singles on the Billboard Hot 100. Most of these hits were written and produced by Motown's main songwriting and production team, Holland–Dozier–Holland.