And the strings of the guitar are an intersection of both interpretations! There are several core wire alloys used and many different kinds of winding wire to achieve different tone and magnetic response.
Fun fact, a common older winding alloy for acoustic guitars was called 80/20 Bronze despite actually being copper/zinc alloy and therefore Brass!
bronze is a word used for all alloys of copper. brasses are a subset of bronzes.
Ah, this is what happens when one dredges up old knowledge and doesn't seek an updated understanding before sharing. Thanks for the correction on the colloquial classification.