Final answer:
During John Coltrane's jazz performances, Steve Davis plays the role of the bassist, working alongside Elvin Jones, who is the drummer, to support Coltrane's improvisational solos.
Step-by-step explanation:
The question refers to the collaboration between musicians during a jazz performance by John Coltrane. In the interplay between Steve Davis and Elvin Jones during John Coltrane's solo, Steve Davis plays the role of the bassist. Elvin Jones is the drummer who collaborates with Davis to provide the rhythmic foundation and dynamic support for Coltrane's improvisations. Steve Davis' work on the bass is crucial in establishing the groove and maintaining the harmonic structure that allows the soloist to explore creative melodies and expressions.