With the exception of compilations and soundtracks, all of my albums are in an "Artist""Album" folder structure. They are alphabetized by last name or band name, etc.
I have a number of albums with multiple artists. For example, Brian Eno & Harold Budd (some in the format of Brian Eno/Harold Budd).
Following my alphabetizing/folder structure, I would think the artist folder should be named "Eno, Brian & Budd, Harold" (or "Eno, Brian-Budd, Harold" since I use "-" in place of ":" and "/" for folders and filenames), but I wanted to see what others have done in this case.