Yes, for me, Library is the library file (that used to be an XML file) whereas my directories full of music are just directories full of music. Which I call my music collection.
You can come up with a books analogy but in MacOS terms the file is called "Music Library.musiclibrary" and is the music library
I hope you don't mind if I continue the dialog.
First, a rose by any other name... Who cares what you call something? In the end, it's the function, not the name, that matters. The function of "Music Library.musiclibrary" is catalog (or index). This isn't just an analogy. Catalogs are catalogs, contents are contents, whether they're stored as bits and bytes or on scrolls of papyrus. If you lose the contents, the catalog is nothing more than a historical curiosity or a guide for re-acquisition. But as long as the contents exist, you can make a new catalog.
And while language is a flexible thing, I doubt you'll find many dictionaries that define "library" as anything other than a collection of books, recordings, films, periodicals, etc. (or the structure housing those materials), or a thesaurus that considers "library" and "catalog" to be synonymous.
I wrote and edited non-fiction print books for about 15 years. Every one of them had a table of contents, every one had an index. Without a doubt, those were both essential tools for getting the most out of the books. Publishers hired professional indexers to be sure that job was done well. If you asked an indexer to review a book... he/she might well go thumbs up or thumbs down on the strength of the index alone. But speaking as the person responsible for the
contents of the book... if the contents sucked, who but an indexer would care that the index was beautifully done?
Meanwhile, Tim Berners Lee hatched this www thing. All sorts of fabulous and useless content, and it soon became hell to find the good stuff. People dedicated entire sites to carefully curated link-lists of useful content. For a while, it was even possible for book publishers to make a buck publishing guides to that content - things moved slowly enough that most links were still valid by the time the book came off the press. The snowball grew, and only web-crawling bots could keep up with the ever-changing contents. "Indexing" fell to Google's coders and site designers practicing the latest SEO techniques. Today, I'd wager a fair percentage of the population thinks Google is somehow responsible for the content it helps us find. Yet as critical as a good search engine is for using the web, if there was no content, we wouldn't need that index.
Let's bring it back to iTunes. Based on all the posts I've read at MR over the years, whether it's music fans curating their iTunes libraries, or photographers grumbling about how they hate the way Apple buries image files inside the Aperture/iPhoto/Photos libraries (or waxing eloquent about how important it is for them to control the folder structure of their media libraries)... If you asked any one of them what's more important, the index list or the media contents... what do you think they'd say?
Having read countless "help me" posts here in MR, I'm going to guess what we'll start seeing in a few months... "Help! I copied the Music Library from my Music/Music folder to my new Mac, and all my music is gone! It's only 6.3 MB!! I had over 100 GB of music!"
I know it will happen, because I recently helped a friend who had managed to do the opposite, with "iTunes Classic." Sometime, years ago, she moved her iTunes Media folders to an external HDD, but left the iTunes Library ITL and XML files on the internal HD. She connected that external drive to a new Mac, but did not transfer the ITLs and XMLs before wiping the drive of the old Mac (Backup? What's that?). So when she opened iTunes for the first time and selected that external drive as the location of iTunes Media folders... "I know all that music is there, but it's not showing up in iTunes!" In the end, fixing it wasn't too hard. iTunes > File > Add to Library... (in the new Music app it's become Music > File > Import...).
But yeah, I just said, "Add to Library." That's what Apple chose to call it, even though functionally it's "Add to catalog." And Music > Preferences > Files has variants on the old iTunes equivalents, "Keep Music Media folder organized. Places files into album and artist folders...." and "Copy files to Music Media folder when adding to library." What's a salmon to do, but keep swimming against the current?
