I'm definitely showing my age but my first concert was Johnny Cash in Minneapolis in the late 50s.

I was mesmerized by his guitarist, Luther Perkins, who was "The Johnny Cash" sound. Luther stood stick-straight and had everyone rocking in their seats. His "boom-chuck" guitar work was actually quite easy to play but it became much-imitated in many genres of the era.

The concert had a lasting influence on me musically.