The music I am testing here is a mp3 inside of a transparent png. That turns it into a one frame transparent video that you can play using a mp4 code.
BUT it is invisible.

https://maskcucumber.heliohost.org/Pages/w3h14.mp4

When you play the song as a mp3 you can see it and stop and start it.

http://www.spiritbones.org/starcycle/123/GuitarMoozic.mp3

The song can also be played as a ogg file.
Some people say the ogg sounds better than a mp3.
But with the little speakers on a laptop, my ears can't tell any difference.

https://maskcucumber.heliohost.org/Pages/GuitarMoozic.ogg