why a sound from 1st scene play when jumping to other scene flash cs6?

i'm a beginner. new to flash cs6. not expert in as3.
i put mp3 sound on the frame which is i want it to be sync with my animation, but when i test movie, the sound played when i jump to the other scene.
i put the sound on the timeline. how to make it not being played on others scene?
somebody please teach me how to put different sounds in 1 animation(1 movie clip), like voice-over or sound effect in flash.
do suggest the better way to sync the sound and the animation.
tq. :)