Lionel Richie and Diana Ross have the most enduring love song of all time. The Motown icons’ 1981 ballad, “Endless Love,” ranks as No. 1 on Billboard’s list of Top 50 Hot 100 hit about love (or with it in its title). The music industry trade publication based the list on weeks at No. 1 and covered songs from all eras of the chart’s history, with the oldest song being 1958′s “To Know Him Is To Love Him” from the Teddy Bears. The most recent song on the full list is Scottish singer-songwriter Lewis Capaldi’s 2019 hit “Someone You Loved.” Written by Richie, “Endless Love” was used as the theme fo…