Why dose music affect personality

Music can affect peoples personality's but why like people who listen to rap tend to

have a gangster personality and people like me who listen to metal have a head banger

personality. A few rapers people listen to may be Three Six Mafia, Lil jon, and

Ghost Face Killa. A few metal bands can be Bullet For My Valentine, Mettalica, and

Suicide Silence. These can affect personality's pretty bad.