There have been fifty years of jazz at Ravinia, and John McDonough has seen and heard virtually all of it. At many concerts, he brought along a portable reel-to-reel tape recorder, capturing undercover—now historic—recordings of many of the great jazz masters. Here are some tracks from his collection we bet you’ve never heard before:

Frank Sinatra
“Where or When”—September 1938
A comic take on the lyrics, Sinatra complaining about the piano, and a crack about Johnny Mathis. A complete take starts at 2 minutes, 22 seconds.