Where's the music coming from?

I had an MRI today (another story to be told soon) and the technician asked if I wanted to listen to music while in there. I figured why not, so I stepped onto the platform, got situated, put the headphones on, and the music started. Not until after I took the headphones off did I realize that I was still hearing the music and it was loud. The music didn't come from the headphones, as I had thought, but from the room itself. The headphones were just so I don't hear the whirring and clicking of the MRI machine. It made me laugh. The technician thought I was crazy.