1. Drums: The drummer is responsible for providing the primary pulse of the music and keeping the band in time. They play a variety of drums and cymbals to create a rhythmic foundation.
2. Bass: The bassist provides the low-end support and harmonic structure for the band. They typically play an acoustic or electric bass guitar.
3. Piano: The pianist adds harmonic and melodic elements to the music. Jazz pianists often improvise and play complex chords.
4. Guitar: The guitarist plays chords and melodic lines to complement the rest of the band. Jazz guitarists can use various techniques such as strumming, picking, and improvisation.
5. Occasionally Vibraphone/Marimba: These help enhance the melody of a composition and add more dynamics.
The interaction and interplay among these instruments are what make the rhythm section in a jazz band. The musicians must listen closely to each other and play with excellent timing and feel to create a cohesive and swinging groove. Each instrument has its role in supporting the soloists and creating an exciting and dynamic foundation for the jazz performance.