singing old songs, playing old tunes is preservation, in the sense that we sing/play as we think it should be played within our limited ability & conceits. There are those that try to re-create the rendition as closely as possible, they are nearer to conserving the original.

As I remember from my days in college. We were asked a lot of questions and noted our answers. Then they asked us to plot them on a 2D graph. What came out surprised me. Left and right were obvious but the vertical axis was labelled "Tough" & Tender". Labour & Tory came roughly where you would expect, liberal (UK flavour) somewhere central. BUT the Nazis were, if anything, left of centre but high on the tough side.
There is a problem with perception and therein (herein to be more pertinent) lies the arguments above.

OK, once you remember that "Nazi" was an contraction of National Socialist it just tells you: perceptions are about as perfect as you & I.

Would the perfect of this parish please reveal themselves?