 Baby Washington and Don Gardner had a duet album out called Lay a Little Lovin' on Me from 73. We heard the title track. William Bell with Judy Clay from 68 with Private Number. Kind of a classic duet there. Edwin Starr and Blinky recording for Motown in 1969. Their album was called Just We Two and we heard their version of Oh How Happy. Start off with a couple of Marvin Gaye duets. Diana Ross and Marvin Gaye from 1979.