Sometimes streaming providers don't use the right mime-types. It would be good, if you just could force mpg123 (at your own risk) to treat a file as something else, then the mimetype suggests it is.
Hm ... this is tricky when you get a bad MIME type from a playlist. The command-line switches (-@) refer to the command-line arguments, not the deeper levels. And things are not enforced.
Well, but there is this:
Did you try this?
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