You are not Louis XIV…..you are the imposteur!
Take the High Level Hornpipe for example. The tune was written by James Hill and belongs in Bb. Off it goes to Ireland and returns in G, or some other playable key (see The Session tunes directory). Quite likely, somebody records it in G, and anybody who hears such a recording regards G as its proper key and perhaps never knows that it originated in a flat key. The Hawk is another instance: written in E major, again by Hill, and now invariably played in D. My question is: can these transpositions be rightly regarded as the same tune? Or are they impostors?