2. Diana Ross & Lionel Ritchie - "Endless Love"
This Lionel Richie-penned track topped the Billboard Hot 100 for a solid two months in 1981, and it's easy to hear why; the lush production and restrained yet powerhouse performances by Richie and his duet partner Diana Ross made it the type of song that any human with even an inkling of romantic feeling could relate to. The reaction startled Richie, who at that point was still with the soul outfit the Commodores: "Things got unbelievable," Richie said in a 1982 interview with the Chicago Tribune. "It was 'Endless Love,' endless award shows, endless everything." Endless variations on that song's theme, too — it's since been covered by Mariah Carey and Luther Vandross, a slew of American Idol hopefuls, and Richie himself (with Shania Twain as his foil).