Weldon Leo "Jack" Teagarden (August 20, 1905–January 15, 1964), known as "Big T" and "The Swingin' Gate", was an influential jazz trombonist, bandleader, composer, and vocalist, regarded as the "Father of Jazz Trombone".
Born in Vernon, Texas, his brothers Charlie and Clois "Cub" and his sister Norma also became noted professional musicians. Teagarden's father was an amateur brass band trumpeter and started young Jack on baritone horn; by age 10 he had switched to trombone. He first heard jazz music played by the Louisiana Five and decided to play in the new style.
Jack Teagarden's compositions included "I've Got 'It'" with David Rose, "Shake Your Hips", "Big T Jump", "Swingin' on the Teagarden Gate", "Blues After Hours", "A Jam Session at Victor", "It's So Good", "Pickin' For Patsy" with Allan Reuss, "Texas Tea Party" with Benny Goodman, "I'm Gonna Stomp Mr. Henry Lee" with Eddie Condon, "Big T Blues", "Dirty Dog", "Makin' Friends" with Jimmy McPartland, "That's a Serious Thing", and "Jack-Armstrong Blues" with Louis Armstrong, recorded on December 7, 1944 with the V-Disc All-Stars and released as V-Disc 384A.
In 1985, Jack Teagarden was inducted into the Big Band and Jazz Hall of Fame.