Which American singer was part of the Citizen Change political service group and spent a record sixteen weeks atop the "Billboard" Hot 100.
Citizen Change: Citizen Change is a political service group, founded by musician P. Diddy, and backed by Mary J. Blige, Mariah Carey and 50 Cent. Mariah Carey:  Carey and Boyz II Men spent a record sixteen weeks atop the "Billboard" Hot 100 in 1995–1996 with "One Sweet Day," which remains the longest-running number-one song in US chart history.
Mariah Carey