Who uses four pianists for one show? My friend Dick Kaufmann does! I recently played at the crooner’s spectacular 80th birthday concert, at which he performed with an impressive array of musicians and singers he has worked with over the years. I played guitar and tenor banjo, along with one piece on piano. The other pianists were bandleader Glenn Pearson; Rich Dworsky of A Prairie Home Companion; and Lee Muziker, who has been the music director for both Barbara Cook and Tony Bennett, among many other credits. Everyone played great, but as a pianist I can tell you that Muziker’s musicianship is not to be believed. His accompaniment sounds like a combination of Igor Stravinsky, Fats Waller, and Frederic Chopin. The moment from the concert I will always remember — well, along with the audience’s delight when Kaufmann brought out his friend and surprise guest Garrison Keillor for a duet — was when I stood in the wings with Pearson and Dworsky, all of us amazed at the fluid genius of Muziker. Sometimes your role as a musician, and a person, is simple appreciation.