"Endless Love" is a song written by Lionel Richie and originally recorded as a duet between Richie and fellow R&B singer Diana Ross. In this ballad, the singers declare their "endless love" for one another. It was covered by R&B singer Luther Vandross with fellow R&B 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.