However, Gaye's greatest duets were with Tammi Terrell, with whom he scored a series of massive hits penned by the team of Nickolas Ashford and Valerie Simpson, including 1967's "Ain't No Mountain High Enough" and "Your Precious Love," followed by 1968's "Ain't Nothing Like the Real Thing" and "You're All I Need to Get By."
The team's success was tragically cut short in 1967 when, during a concert appearance in Virginia, Terrell collapsed into Gaye's arms on-stage, the first evidence of a brain tumor that abruptly ended her performing career and finally killed her on March 16, 1970. Her illness and eventual loss left Gaye deeply shaken, marring the chart-topping 1968 success of "I Heard It Through the Grapevine," his biggest hit and arguably the pinnacle of the Motown sound.
