Type/type background music, and a lot of background music will appear. Choose for yourself.

In addition, there is a "View" menu on the webpage. Under this menu, there is a "source file". You can see the source code after clicking it. Where the background music is found in the source code, there should be a link through which the background music of the webpage can be found. Of course, some files can't be found, and there may be problems with linked files, but this is rare.