The ANOMALIES (???)...of Clical Music identification NOMENCLATURE: J.S. Bach-"BWV"/ Mozart-"K.402"/etc.?

I always thought that was perplexing as well, until my second piano teacher explained the whole cataloging system to me. (I won't go over that again as everyone has explained it beautifully!) But yes, it generally has to do with who the cataloging person was--and usually, they used their initials :-) LC-B