When my Dad was stationed at Fort Sill, 1972-1977, I had the great fortune to attend Eisenhower Jr. High School. Our principal was Abraham Deutschendorf, uncle of Henry John Deutschendorf. We were treated to two concerts while I attended 7th and 8th grades - John Denver and a box gitfiddle. Not bad for a folk singer, but I thank God I'm NOT a Country Boy. At the time, I, and most of my classmates, were into KISS, Rush, Foghat...or Donna Summer, The BeeGees, The Commodores, KC & the Sunshine Band...or Conway Twitty, Merle Haggard, Crystal Gayle.
John Denver didn't register with any of us as Rock, Disco, R&B, or Country.
I saw Sir Reginald Dwight a couple of years later. I had several of EJ's albums, and I knew all the songs. Now this was more like it. I saw Elton John a few years ago, and the show was as good, or better, than when I was a kid. Rocket Man, for crying out loud!
I vote Elton John.
Actually, I vote John Lennon. John Fogerty. Olivia Newton John. Johnny Cash. Johnny Mathis.