Stop music block from making sound when deactivated

I made a block that makes sound when activated with redstone. The sound is about 3 seconds long and looped, the shortest I can make it is 1 second. The problem is that when the block is broken or redstone is deactivated, the sound keeps playing. /stopsound isn't an option because when you have multiple of the block, all of them go silent (unless it has some secret use that I don't know of). Is there a way to make only one block stops it's sound and let the others keep playing? Thanks.