What language? if it's python or js, you can use the repl.it audio, already integrated audio. Find out more here. For another language, you can find out at that same link for how to add audio.
for HTML, check this out.

check out my game post here where I integrated music in python, you can look at the code.

Good luck! ;)

Check out this same post:

https://repl.it/talk/ask/music/60427

In this case, you can import the "playsound" module (after downloading it). You give it the name of a downloaded file to play, and it will play it. For example, I wanted to play some rap music. Using playsound.playsound() in the module, you would here the song. If you would like, you can do more research about playsound.

What's your repl?

Um, can we please have some clarity on what you are trying to do? How does this music bot work? Does it shuffle between pre loaded songs? Does it allow you to make your own music?