The book Music, The Brain, And Ecstasy: How Music Captures Our Imagination, which covers a lot of the neuropsychology of music, reveals current research on how music affects us.
Personally, as someone who experiences music very emotionally, I found this book enlightening on many of the mechanisms or processes by which this happens. Also, I learned quite a bit about the cultural roles of music, and a lot of extremely interesting human experiences.
However, I also felt that the author, Robert Jourdain, jumped to several inferences or conclusions inappropriately. Also, as most if not all writers do, he infused a lot of his personal preferences into the text in the form of more general assertions. For example, his taste for classical music leads him into multiple statements that seem unfairly praising of elements in classical music and critical of more modern, fun music.
Overall, a really good read, highly recommend!