Simplify the following text for a Grade 9 native English-speaking person.
Original: Originally founded as The Primettes in Detroit , Michigan , in 1959 , The Supremes ' repertoire included doo-wop , pop , soul , Broadway show tunes , psychedelic soul , and disco .
Simplified: The Supremes ' were known for their doo-wop , pop , soul , Broadway show tunes , psychedelic soul , and disco .