While performing with Jerry Butler in Detroit in 1965, Terrell was spotted by Motown chief Berry Gordy, Jr., making her label debut with "I Can't Believe You Love Me." When subsequent outings "Come On and See Me," "This Old Heart of Mine (Is Weak for You)," and "Hold Me Oh My Darling" earned little notice, she was paired with Gaye, who previously recorded duets with Mary Wells and Kim Weston. His chemistry with Terrell was immediate and in 1967, they entered the pop Top 20 with the magnificent "Ain't No Mountain High Enough," the first in a series of lush, sensual hits authored by the husband-and-wife team of Nickolas Ashford and Valerie Simpson. "Your Precious Love" cracked the Top Five a few months later and in 1968, the twosome topped the R&B charts with both "Ain't Nothing Like the Real Thing" and "You're All I Need to Get By." The success of these later hits was nevertheless tempered by Terrell's off-stage travails -- after an extended period of severe migraine headaches, in 1967 she collapsed in Gaye's arms while in concert at Virginia's Hampton-Sydney College, and was diagnosed with a brain tumor.
Although the tumor forced Terrell to retire from performing live, she continued to record with Gaye even as her health deteriorated; however, as time went on, Valerie Simpson herself assumed uncredited vocal duties on a number of hits, including 1969's "Good Lovin' Ain't Easy to Come By" and "What You Gave Me." (For several other tracks, Gaye's vocals were added to pre-existing Terrell solo recordings.) In all, Terrell endured eight operations, ultimately resulting in loss of memory and partial paralysis; she finally died in Philadelphia on March 16, 1970. Gaye was so devastated by her decline and eventual passing that he retired from the road for three years; her loss also contributed greatly to the spiritual turmoil which informed his 1971 masterpiece What's Going On. At the time of her death, Tammi Terrell was just 24 years old. ~ Jason Ankeny, Rovi