The 21-year-old Armstrong, on cornet, was a protégé of New Orleans fellow cornetist and band leader King Joe Oliver. On April 5, 1923, they went into a Richmond, Ind., studio for a two-day session.

If we were to take all the major trumpet players in jazz, line them up in chronological order, ask them who they listened to and were influenced by, then send them down the long dark chute of jazz ...