Do you know if listening to a certain genre of music increases/ and or decreases intelligence?

No, listening to music doesn't increase or decrease your intelligence level. People will make up any kind of fabrication to justify their hatred or disdain for music they don't like. For example, i listen to hip hop sometimes and people say that music makes you violent or is for dumb people, but yet I have never been arrested and graduated from college and have a very respectful job. Don't believe everything you read or hear and never allow anybody to influence what kind of music you can and can't enjoy. Listen to what music you want, and respect others for their different taste of music that you may not like or appreciate because music is subjective anyway.