That paradigm is wrong. Musicians usually process melodies in their left hemispheres. Many of our greatest scientific thinkers, like Einstein, have discussed the integration of imagination into scientific pursuit. The use of art not just to draw but to teach thinking and to build emotive expressiveness and memory has been a remarkable demonstration of the brain's plasticity. The value of music as a component of enriched learning has long been recognized in education.
Many schools offer music education in gifted programs.
In fact, considerable evidence suggests a broad-based music and arts education should be required for every student in the country. Reading music also engages both sides of the brain. Once someone learns how to read, compose, or play music, their left brain gets very involved. Arousal means the music either increases or decreases the attention transmitters. Relaxing music might include a waterfall or soft piano melodies.