Hard to believe, but Willie Nelson and George Strait have never sung together, until now. The two sang their first ever duet Saturday night in Nashville during a tribute show honoring the 85-year-old Nelson. The two sang a song written just for the occasion called, "Sing One With Willie," in which Strait says to Nelson, "You just made my career" and Nelson replies, "Or ruined it." You can see the performance below. More than two dozen artists sang in honor of Nelson during the show, including Kris Kristofferson, Jimmy Buffett, Alison Krauss and more. The show will be aired on A&E at a later date.