Out of tune

Johnny Cash has received plenty of radio play lately. He favored about three chords. I've always liked his voice, but he certainly did have trouble with intonation. He had difficulty staying on pitch more often than not. Others with the problem that come immediately to mind are Ernest Tubb, Leonard Cohen, and Kris Kristofferson. Cohen and Kristofferson will not be immortal for their performances, but for some of their compositions. Ernest Tubb had one of the greatest bands ever throughout his career and a sly way of phrasing. I can't think of any female artists with successful careers despite such a defect, although certain Cher always just flirted with being flat.