How do i make music play?

[JackFrost]

It has to be automatic, work in iframes, and use mp3s.

[Melooon]

Code

 <audio autoplay loop>
 <source src="horse.mp3" type="audi:ha:mpeg">
</audio>

That should work for you, just link your mp3 file in the src; ALTHOUGH neocities wont let you upload mp3s without paying for supporter; so you’ll need to upload the mp3 to another host like https://ichi.city/

You can see more about the audio tag here: https://www.w3schools.com/TAGS/tag_audio.asp