Marvin Gaye and Tammi Terrell’s 1968 duet “You’re All I Need to Get By” is a soulful pledge of unwavering love. Penned by Ashford & Simpson, it features Marvin and Tammi in perfect harmony, vowing that together they can overcome anything. Their chemistry leaps off the record, carrying the song to No. 1 on the R&B chart and into the pop Top 10. It remains one of Motown’s most cherished duets.