Willie Nelson and Kacey Musgraves share a sweet duet

Musgraves and Nelson had previously collaborated on Musgraves' 2015 album, "Pageant Material" and her holiday record, "A Very Kacey Christmas."At one point, it appeared as though Nelson, 86, was struggling for breath, but he pulled off the performance.In 2015, Nelson had undergone a stem cell procedure for his lungs, saying at the time: "Over the years I've smoked a lot of cigarettes, and I've had emphysema and pneumonia four or five times, so my lungs were really screwed up, and I had heard that this stem-cell operation would be good for them. So I said, 'Well, I'm gonna try it out.'"In August, he postponed the tail end of a tour due to breathing issues. He has since recovered and had resumed touring in September. On Wednesday night's duet of "Rainbow Read More – Source