Howard Lewis Johnson was an American jazz musician, known mainly for his work on tuba and baritone saxophone, although he also played the bass clarinet, trumpet, and other reed instruments. He is known to have expanded the tuba’s known capacities in jazz.

Ian Ernest Gilmore Evans was a Canadian–American jazz pianist, arranger, composer and bandleader. He is widely recognized as one of the greatest orchestrators in jazz, playing an important role in the development of cool jazz, modal jazz, free jazz, and jazz fusion. He is best known for his acclaimed collaborations with Miles Davis.