here's the code i use for it!
<iframe width="0" height="0" src="https://www.youtube.com/embed/REPLACE//?&;amp;;autoplay=1&;loop=1&;controls=1" title="YouTube video player" frameborder="0" allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture" allowfullscreen="" loading="lazy">
</iframe>
what you need to do to make it the song you want specifically is to replace the part that says "REPLACE" with the last part of the YouTube URL for the song you want. for example, if i wanted the song from https://www.youtube.com/watch?v=zfiXEJw5CF4, i would put zfiXEJw5CF4.