Music can be a hassel at first. I always pre load my sounds and music by name, and give them tags. I believe you need to use the "tags" to stop sound. I also like to use a timer to trigger the sounds and music in a layout.
I had just opened up an example file created poster by Vee41 over here...
I hope it is ok with them, but since I already had it opened just I added another layout to bounce back and forth from, a few more actions and music for each layout. Hopefully this may help you out.
vee41 hope ya don't mind.
So here it is, worked in Chrome so far
Vee41s grid with sound