Let's see.....I think my first concert was at the Iowa State Fair around 1967, when my cousin was a member of the singing group "The Young Americans"- remember them? I was very star-struck with my cousin and that might have been when the desire to pursue performance started.
Also on the bill that evening was Tennessee Ernie Ford, who told some dirty jokes, at least to my tender young ears. I always liked him.
I think my first jazz concert was Stan Kenton around 1972.
Also Return to Forever in '73 or so. I remember that concert, there was major pot smoking going on. Culture shock to this tender Iowa youngster!