The background music can be placed on the page using the "Video and Audio" object, but it depends on the browser and its settings whether the music can be heard.

You can find my test page with background music at ...

>> https://findelinks.de/go-blogseite/galerien.html

There is also a description there of how to play background music in different browsers, but the description is in German, perhaps you can translate it with Google.

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My problem is that I have still an audio clip playing, but there is no Video & Audio object on the page!  It was there at one time, but it has now been removed.  I have cleared out everything on the web server, in case there was some residual code there, and have reloaded the entire website but the audio is till playing when the page launches. I am truly mystified!

It could be that the old page with the music is only in your browser's cache, in which case the browser cache would need to be cleared.

Otherwise, provide a link to the page with the music so that the helpers can search for the code for the music in the source code.

Here an expiremental function . Could be interesting

https://developer.mozilla.org/fr/docs/Web/API/Cache/delete

Thanks Daniel for your comments, which enabled me to locate the source of the issue.  I had a sound configured to play in a Gallery object, which I had completely forgotten about! However, I cannot find a way to remove this mp3 file, but can only replace it - there doesn't seem to be a way of deleting the entry. For the time being I have substituted the sound clip with a very short ping in mp3 format, but please let me know how I can completely remove sound from the Gallery.