I am not now nor have I ever been an accordionist. However, I once played three county fair shows with Myron Floren. I don't know if you consider him brilliant, but he sure was a nice fellow and a true pro. His entire book arranged in show order, all charts neatly written, no dogeared or ripped pages like you usually get with traveling performers, and a very easy guy to work with, although the tempos were pretty demanding on some of those polkas and things like Tico-Tico. Floren had huge hands, and I couldn't figure out how he managed that small keyboard, but he certainly did. I was playing piano, and a couple of other local musicians were on bass and drums. Apart from that show, my only up-close and personal experience with the accordion was one time when I caught Art Van Damme in some jazz club in Boston. Him, I consider brilliant.