I was on a video call today on Skype with my headphones. I started to listen to music on Youtube with my headphones in middle of the call. Can other people in the call have heard the music was listening?
Can you hear the music with the headphones off? If you can't hear the music with the headphones off, your computer's mic can't hear it. If you're blasting the music into the room out of your computer speakers, then your computer mic will pick it up and the people on the other end of the Skype call will hear it.