Music is believed to involve functions of the right hemisphere. In trained and experienced musicians, however, the left hemisphere appears to have taken over many of these music-related functions. (Miller, Lawrence, PhD. Inner Natures. Brain, Self & Personality. p 79-80. NY: Ballantine Books, 1990.)
Studying and playing any keyboard instrument (e.g., piano) that requires the use of both hands stimulates both cerebral hemispheres. (Joy, Donald M., PhD. Bonding. 104. TX: Word Books, 1985.)
Melodies are perceived better when listened to with the left ear (more connections with the Right Hemisphere). Verbal stimuli are perceived more accurately when heard with the right ear (more connections with the Left Hemisphere). (Williams, Linda. Teaching for the Two-Sided Mind. p 21-22. CA: Touchstone Books: 1986.)
Music exercises both hemispheres: the words for the left hemisphere, the melody for the right. (Healy, Jane M., PhD. Your Child’s Growing Mind. p 140. NY Doubleday, 1987, 1989.)
Normally human beings can switch easily between the two cerebral hemispheres. Describes how a composer can create separate instrumental lines on an orchestral score and then hear how everything sounds together. (Miller, Lawrence, PhD. Inner Natures. Brain, Self & Personality. p 79-80. NY: Ballantine Books, 1990.)
Harvard Medical School and Boston College researchers have found that taking music lessons can strengthen connections between the two hemispheres of the brain in children, but only if they practice diligently. For the children who practiced at least 2.5 hours a week, a region of the corpus callosum that connects movement-planning regions on the two sides of the brain grew about 25% relative to the size of the brain. (Source)
Jimmy Hendrix said that music could hypnotize people, at which point one could put information into their subconscious minds through preaching/talking. (Torres, Carol A., and Louis R. Torres. Notes on Music. p 8-12. OR: TorresLC Ministries, 2004.)
Refer to Human Brain for additional Information.