I'm so fed up with this! I'm going over to ask my neighbours in a not very polite way to turn the music off
Why do you not want to be polite to your neighbors?
Enough is enough, I'm tired of this, I've asked them politely previously to no avail.
Consider seeing if your area has laws regarding how much noise can be made at certain times. Involve the police but don't confront your neighbors in a rude way or else you may have trouble elsewhere.
OK. I'm going to go over there now.
I would really urge you to reconsider confronting them while you're angry. They will probably feel attacked and get defensive. This could result in bigger trouble for you than the music was.