newb trying to change music in a zone

[Slough]

First time looking at this, and I'm trying to mod my own install, not create an addon. I tried to change the music in a zone by editing game\modules\tome-1.5.10.team\data\town-last-hope\zone.lua. I changed the line: ambient_music = {"For the king and the country!.ogg", "weather/town_large_base.ogg"} by replacing "For the king and the country!.ogg" with another filename from the original music.team. But it doesn't change what plays. I guess it's not that simple, so any direction would be much appreciated. I also tried adding a renamed copy of another .ogg in music.team - didn't work either.