As mentioned in title, complete begginer, when checking the Internet I found no solution, pls help.

Adding music is a bit out of scope of our offering. It shouldn't be too hard to add music to the website you host your bot on. 🚀 This is the first example I found online to do what you are looking for https://www.tutorialspoint.com/How-to-add-background-music-to-your-web-page.