The statement that best defines the term jazz-rock is:
b. Jazz improvisation mixed with R & B rhythms and instruments
Jazz-rock combines elements of jazz music, like improvisation and complex harmonies, with the rhythms and instruments commonly found in R&B music. This fusion creates a unique sound that blends the sophistication of jazz with the groove of R&B. In jazz-rock, you may hear intricate solos, unexpected chord progressions, and a rhythmic feel influenced by R&B music. The incorporation of both jazz and R&B elements distinguishes jazz-rock from traditional jazz or rock music.