Indianapolis, why don't you sing? I am reading This Is Your Brain on Music, which is fascinating but also tantalizingly inconclusive. I suspect that reflects the current state of neuroscience -- we know just enough about the brain's mechanics to have our interest triggered, but not enough to satisfy our curiosity. I'm still waiting to learn why perhaps the most thrilling of all neuromusical experiences is hearing a song you love successfully transposed into a different genre. E.g. this, via Emily Gould.