[shakethemonkey]

This isn't true. Replaying public domain music through mechanical means adds no creativity to the work, and thus has no copyrightable elements.

[est31]

For reference: this was specified in article 14 of the new EU copyright directive. One of the few good changes in it: https://eur-lex.europa.eu/legal-content/EN/TXT/HTML/?uri=CEL...

[empressplay]

The type and timbre of the instrument used, the speed and volume of playback, any post-processing decisions, etc. are all creative choices and thus can make a resulting work copyrightable.

Be careful using generic music from the Internet.