[Article] Why Music Makes Our Brain Sing
In this article, the researchers have found that the neural activation in striatum and auditory cortex when we listened the song.
And also they try to figure out the what is going on when someone hears a new piece of songs or music and dicides he likes it enough to buy it.
More detail: http://www.nytimes.com/2013/06/09/opinion/sunday/why-music-makes-our-brain-sing.html