Remembering when Marvin Gaye and Tammi Terrell made beautiful music and topped the R&B chart for August 31, 1968 with ‘You’re All I Need To Get By.’Marvin Gaye was on fire in 1968. The Motown star had been having hits for six years, and had topped the US R&B charts twice already, both times in 1965. But in the year that he turned 29, there was no stopping him. Gaye had three Billboard Soul No.1s in the space of six months in 1968, two of them with one of his great duet partners, Tammi Terrell, who would tragically die of...