I am a jazz guy so for me the best of the best is going to be jazz, and as anyone who knows anything about jazz will concede, the first and foremost jazz performer of all time was Louis Armstrong. The rarest of his early recordings is "Cake Walking Babies from Home" with Clarence Williams' Blue Five, OKEH, January 8, 1925. The cleanest reproduction of it on vinyl can be found on the Time-Life Giants of Jazz, Louis Armstrong set, record 1, side 1, which also has excellent copies of the more famous Hot Five and Hot Seven recordings. As an audiophile recording, this is a non-starter, but as music, in the words of Duke Ellington, it is beyond category.