Cerebellum
The cerebellum is known for its functions in motor skills. Motor commands are not initiated in the cerebellum; rather, the cerebellum modifies the motor commands of the descending pathways to make movements more adaptive and accurate. Trial-and-error processes are fine-tuned here to make adjustments or improvements.
How does this relate to music?
The cerebellum helps to create smooth, flowing and integrated movements when hearing or playing music. It works in harmony with other parts of the brain to affect rhythmic movement in the body when moving in response to the music. The cerebellum allows a performer to move the body in accordance to reading or visualizing music when playing a musical instrument. The tapping of your foot or the movement to the music you feel when you hear rhythm is associated with the cerebellum. The cerebellum helps interpret rhythm.