background music

[Lordthom]

Hello all, another question. This Time i make a movie. I selected the backgroundmusic i wanted with a trigger:

• Sound - Play Score Defeat Music - Terran for (All players) (at 100.0% volume, skip the first 0.0 seconds)

but now its plays the basic (random) background music AND my choosed song. How can i mute the "basic (random) background music" but still the other one?

thx