u/Kitelf

She read it in middle school in Poland. So around 1995-98.

The only thing she remembers is a Donald Duck playing a harp or lira ( maybe bagpipe) to open a small hill and there was a treasure inside.

She remembers a bit of medieval/scotch vibe?

If there’s any chance or hint what it might’ve been, please help.

She read it in either gigant or mamut series.