How to embed a background sound on a game

Answer 1

an example
https://code.sololearn.com/WxdxINmMI3ru/?ref=app

Answer 2

What's the source of the sound? (Hosting you own file, getting it from a site, generating your own sounds...like midi?)

I ask because there's more than one way (and caveats) to get at this; it gets more focused if you're already planning to use a certain source.

For examples, search CodePlayground for Music, Radio, Audio and YouTube; probably 'trending' codes.