Serve mp3 stored at somewhere else to public

Dear Thomas,
Say my installation is mydomain.com and my audio files at at mydomain.com/audio/xxxx.mp3 . But I want my front end to render pages so that they link to SomeWhere.com/audio/xxxx.mp3 .
"SomeWhere" is actually some kind of cloud drive where I do not have Joomla. It is just a web-accessible storage.
I constantly mirror my files in "audio" folder to that SomeWhere.
How can I do this? It would save me huge bandwidth cost if I could do this.
Thanks a lot.
Ken

I would use an extension like ReReplacer. It can replace anything you want in the rendered output with something else. So you would search for "mydomain.com" and replace it with "SomeWhere.com". I'd say that should work.
See www.nonumber.nl/extensions/rereplacer

Yes, it does the trick.
You gave me the million dollar answer.

You're welcome