Dizzy Gillespie liked the effect. He had the trumpet straightened out the next day, but he could not forget the tone. Gillespie sent a request to Martin to make him a "bent" trumpet from a sketch produced by Lorraine, and from that time forward played a trumpet with an upturned bell. By June 1954 he was using a professionally manufactured horn of this design, and it was to become a trademark for the rest of his life. Such trumpets were made for him by Martin (from 1954), King Musical Instruments (from 1972) and Renold Schilke (from 1982, a gift from Jon Faddis).
Dizzy Gillespie a session led by Coleman Hawkins with Gillespie as a featured sideman on February 16, 1944 (Apollo), the first formal recording of bebop. He appeared in recordings by the Billy Eckstine band and started recording prolifically as a leader and sideman in early 1945. He was not content to let bebop sit in a niche of small groups in small clubs. A concert by one of his small groups in New York's Town Hall on June 22, 1945 presented bebop to a broad audience; recordings of it were released in 2005. He started to organize big bands in late 1945.