The Supremes were the most commercially successful of Motown's acts. They are, to date, America's most successful vocal group, with 12 number one 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. At their peak in the mid-1960s, the Supremes rivaled the Beatles in worldwide popularity. Their success made it possible for future African American R&B and soul musicians to find mainstream success.