Jack Armstrong Blues Teagarden Jack 1951
In this clip the "Jack Armstrong Blues" Jack starts the blues with his famous empty water glass effect
Teagarden could actually play in a way that appealed to him. It relied heavily on using unusual slide positions and aalso on his ability to bend notes with his unusually flexible embouchure. His style is generally considered to be literally "inimitable."
Teagarden had a mechanical bent and a life-long interest in tinkering with things, and he invented the water glass mute effect, in which the bell section of the trombone is removed and an empty water glass placed over the end of the instrument tubing (of the mouthpiece section). The effect is a stifled, plaintive sound which makes the instrument sound even more like a blues singer.