>can you apply to be an editor in more than one place?
Once you are an editor, there are "fast-track" methods you can use to get quicker access to other small categories. Once we know you can do decent work, we'll want to get as much out of you as we can. (Modus operandi for a volunteer organization, right?)
For instance, if there is no category for "P.D.Q. Bach", you could build one in your editor bookmarks (starting the minute you were accepted to the, say, "Michael Weiss" category), and then ask for it to be moved into public view.
You can also take part in editor discussions of pseudo-classical and/or ancient music, thus displaying a breadth of knowledge and consummate eloquence that we can't so easily see in ordinary, potentially pseudonymous, editor applications.
And you can see where help is needed, and show a willingness to help that will encourage us to give quickly you all the dirty jobs, including "Arts/Bands and Artists/Britney Spears/Fan Pages/Illiterate" or "Business/Industries/Construction/Spackling and Griping."