In the world of musicology, I doubt anyone is quite so famous as Ludwig Ritter von Köchel, pictured left. That's because he catalogued Mozart's music in the 1860s and thus bestowed on every Mozart composition then known the 'K' numbers that have adorned them ever since. Mozart, of course, being the veritable God of classical music, Herr Köchel therefore has acquired some of his glory by reflection!
So, whilst non-musicologists might talk about Mozart's Symphony No. 41 -or, conceivably, his Jupiter symphony- those in tune with their inner Köchels know it as K 551. Similarly, Mozart's Requiem is now given the Köchel number K 626. [...]