Sandra Sully is a songwriter who co-wrote Bobby Womack's "If You Think You're Lonely Now". In 2006 she she was credited as a co-writer of Mariah Carey's Grammy Award winning song "We Belong Together" which incorporated part of "If You're Think You're Lonely Now".[1]
Sully also co-wrote "Angel" and "Sometimes" by Anita Baker, as well as "Just Ain't Good Enough" by Johnnie Taylor. She was previously a member of "The Love Machine", an all-girl group.