obviously.
But I met a couple of people, (musicians), that did. One recorded with him in Nashville. According to this guy Glen was one of the most respected guitarists in the world... highly regarded across the entire recording industry.
I didn't bother to search some youtube examples, (I'm too lazy), but back when Roy Clark passed away and we discussed him on this board I did look into YouTube's featuring Glen showing off his playing skills, (rather than just his popular songs), and they ARE available. - JamesJM