There’s always a polite way to have your neighbor turn down his music.
My dad had a neighbor when he was young that played his radio loudly all day, even when he wasn’t home or was gone on vacation. Every time he left the house and his radio was still on, my dad would go and trip the circuit breaker to his condo.
One day he sees my dad, who was an electrical engineer, and asked him why his breaker kept tripping – was it faulty wiring? No, my dad explained, the loud radio was probably just putting too much strain on the circuit when left on all the time. My dad suggested he should try turning it down or off when he wasn’t home, and see if that fixed it.
So the man tried it, and surprise surprise, the circuit breaker stopped tripping! He was very thankful to my dad for helping him with that annoying electrical issue.