Is there any way to detect when a sound is playing and give an effect after it starts?

Hello. I am working on a custom music disc mod and I was wondering if there is any way to check when a certain sound is playing (like a record sound) and give the people who can hear it an effect. I know I could make a right click procedure but I want this to work on a "backpacks" mod my friends and I are playing with, since there is a disc slot there.

Any help would be greatly appreciated and thank you in advance for said help.