I like music for the mental "reset" after a shot - both good and bad shots. Like someone said earlier....after it's left my hand I have no control over it anymore. Process over result - it works in many ways in life. I've played my best rounds by having the earbuds tuned to really good music, intense focus on each shot but otherwise just looking at the sky or forest around me while everyone else shoots and walks. It kinda pisses some people off but it's my round to shoot.
Remember, you paid to be there, whether it's just gas money to the course, or traveling across the country for Worlds. Good shot or bad shot - forget it and focus on the next shot. Easier said than done....I know. Try some music, hey, it worked for Barry Schultz this year at Worlds!