Stop all sounds except for one

Hey guys, I’m having a problem and I’m hoping someone can assist me.

I have three movie clips with sound on my timeline. When I go to one they all start playing and I can hear all three at once. I want one to be on the stage playing and the other two to be silent.

Here’s the code I have that isn’t working:

On each frame in the main timeline that a movie clip is on the stage I have

stop();
monster_mc.stop();
creepyFace_mc.stop();
hospital_mc.play();

Any suggestions?

Thank you in advance.