Alfonso "Fonzi" Thornton is a U.S. songwriter/producer and vocal contractor. In a career spanning 40 years, Thornton has sung backing vocals for top artists across many genres of music. His vocal credits can be found on the recordings of Aretha Franklin, Luther Vandross, Mick Jagger, Bryan Ferry, Roxy Music, Chic, Diana Ross, Garth Brooks, Ray Charles, Mariah Carey, Steely Dan, David Bowie, Robert Palmer, Patti LaBelle, Al Jarreau, Michael Jackson, Celine Dion, Phoebe Snow, Scritti Politti, Bette Midler, Lady Gaga and many others. In 2008, Thornton joined the musical entourage of Aretha Franklin as backing vocalist and vocal contractor and continued to accompany her in concert, on recordings and TV until her death in 2018.