through the topic viewtopic.php?f=1&t=6907, I have looked at the subcategories of "Sacred Music" and noticed that there are several duplicates, and some categories are a bit odd. I would therefore suggest to aggregate the following subcategories under a single name each:
Tenebrae music & Tenebrae responsories
Lamentations & Laments & Sacred Laments
Burial Services & Requiems
Some of these categories are actually subsubcategories: "Introits" actually is a subsubcategory of the subcategory "Mass propers" (should this subcategory therefore be merged into "Mass propers"?).
It seems that uploaders are quite confused by these categories, too: a number of Magnificats are classified as "Vespers" and others as "Evening Canticles" (is this the proper category? Should it not be simply "Canticles", which stands for the few psalm like texts from the new testament?). Even more confusing is the class "Preces and Responses" (in English: "Prayers and Answer songs"): there are some settings of "Pater noster", but none of "Ave Maria", which is a prayer, too. And most pieces in the category "Responsories" are actually "Mass Propers"...