The Chad Mitchell Trio put the two songs together on their 1961 concert album "Mighty Day on Campus."   They called it "Johnnie" and it went over well enough for them to continue performing it in all their CMT reunions to date.   Their particular rendition was the first time I'd ever heard "Johnny, I Hardly Knew Ye" back when I was a kid. I've been singing the two songs together lately, as well.

                                     Ray