Would you ever go out with someone who listens to Justin Bieber? My girlfriend and I have many common interests, but when it comes to music her love of mainstream pop is just hard for me to digest.
So, what do we know about the psychology of musical preferences?
There are two radically opposed views about this: One is that song preferences are completely random (this includes the idea that arbitrary subjective experiences can make you like or dislike the same song); the other, that our musical choices reflect important aspects of our personality.
How is it then that our musical preferences come to reveal our inner thoughts and feelings?
The answer is really quite simple, namely that music fulfils three important psychological functions.
Indeed, scientific research shows that people listen to music in order to: (a) improve their performance on certain tasks (music helps us combat boredom and achieve our optimal levels of attention while driving, studying or working); (b) stimulate their intellectual curiosity (by concentrating and analysing the music we hear); and, most importantly (c) manipulate or influence their own emotional states with the goal of achieving a desired mood state, e.g., happiness, excitement, and sadness.
Given that mood states are closely related to our personality (in fact, personality is to climate what mood is to weather), and given that people use music for emotional regulation, a scientific understanding of musical preferences should provide the perfect window into a person's soul.
2) The choice of a particular musical genre is driven mostly by our social identity (e.g., if you think of yourself as an intellectual you will like Jazz or Classical, if you see yourself as a rebel you will like Rock or Heavy Metal, although preference for Rock and Heavy Metal is more common today in middle aged IT programmers than in youth in revolt, and the intellectuals of tomorrow will probably listen to 50cc and Jay Z).
Thus, age, sex, and socio-economic status are more relevant than personality when it comes to explaining any genre-based preferences.
c) The major function of music is emotional, but psychologists have yet to understand the connections between different songs and different emotions.
This is a major task, not least because of the amount of music that exists.
And yet, few robust links between personality and musical preferences have been identified so far.
In fact, most findings are far from counter-intuitive (e.g., aggressive people like Heavy Metal, clever people like Jazz and Classical, rebellious people like Hip Hop and Rock), which suggests that you do not need to be a personality expert to understand the psychology of music.
Ask laypeople to provide an informal profile of someone based on their favourite playlist and they will probably be as accurate as the best psychometric test.