Catholics often confuse or at least pretend to confuse the Protestant doctrine of Sola Scriptura (literally "By Scripture Alone"), the idea that Sacred Scripture is the ultimate and infallible source of Christian authority, with the much more extreme Calvinist doctrine known as the Regulative Principle, the idea that only those elements that are instituted, commanded, or appointed by command or example in the Bible are allowed in Christian worship. It's an easy misrepresentation that creates the opportunity for a strawman argument.
Glad you explained that. Would that mean that as far as Calvin was concerned we could have trumpets and timbrels in worship services but trombones and euphoniums are definitely OUT. And as for electric guitars. .