Almost all of my physical media has been in storage for a year and a half. I'm not using physical media at all right now. I've got the bulk of my CDs ripped to Apple lossless. That's all in iTunes, alphabetical order by Composer, Composition, Performer if Classical, by Performer then Album Title otherwise. There's considerable re-organization of those files in my DAP to make Classical music searchable and to subdivide musical genres: Ambient, Avant, Blues, Classical [subdivided into historical eras, Medieval, Renaissance, Baroque, etc.], Collections, Country, and so on, ending in "World". So, "Classical" [within Classical] is Beethoven, Haydn, Mozart, Rossini. Beethoven subdivides into composition type [Concerto, Symphony, Piano Sonata and so on] and performer within each composition type. Conductor first, so Bernstein's NYPO #2 & #7 are in the same folder as the complete cycle with the VPO. The folder of Bernstein's Beethoven Symphonies is within a folder of all of Beethoven's Symphonies, subdivided by Conductor. The same sort of file organization applies elsewhere. "The Beatles" are a folder in "Rock", subdivided by album, marked with the year of the transfer for that album. Some are needledrops of the Mono LP reissues from 2014, some are the 2009 transfers, some are otherwise. Used to have the "White Album" in three different formats [including the mono CD and the first CD transfer], now just have the frankenformat of the 2018 remix. World Music subdivides by country, then by performer. There's a "Collections" subdivision inside of "Country" and "Jazz", but "Oldies" [mostly Collections] has a folder for the 12 volumes of "East Side Story" and a folder for "Time-Life" collections. Collections within collections.
I made all these files and folders because the screen display of the Fiio M3K is very limited in the amount of text visible at any given moment, so searching is much easier with folders within folders. Also gives the whole enterprise that "Library of Babel", infinite archive vibe.