“Endless Love” is a song written by Lionel Richie and originally recorded as a duet between Richie and fellow soul singer Diana Ross. In this ballad, the singers declare their “endless love” for one another. It was covered by soul singer Luther Vandross with pop singer Mariah Carey and also by country music singer Shania Twain. Richie’s friend (and sometimes co-worker) Kenny Rogers has also recorded the song. Billboard has named the original version as the greatest song duet of all-time.