I think this song is an expression of the conflict between one's rational thoughts and one's emotions. The brain is a person's logical decision-making mechanism, but the heart is in a 'suburb' - it's telling her to do something that's not rational to her brain. But of course she really wants to 'follow her heart' - so what's she going to do? Write a song, of course, sing some 'na na na's. :)
I think this song is an expression of the conflict between one's rational thoughts and one's emotions. The brain is a person's logical decision-making mechanism, but the heart is in a 'suburb' - it's telling her to do something that's not rational to her brain. But of course she really wants to 'follow her heart' - so what's she going to do? Write a song, of course, sing some 'na na na's. :)