Stop background music when go to another scene

Im using this code as my background music,i want to stop the music when i leave current scene. What should i add to make it stop when i go to next scene.

import flash.media.Sound;

import flash.net.URLRequest;

import flash.media.SoundChannel;

var music2:Sound = new Sound(new URLRequest("audio/bgmusic2.mp3"));

var sc2:SoundChannel;

sc2= music2.play();