I have audio available (recorded or I can sing/play it)
Musipedia (hum, enter notation, or enter pitch "contour" [i.e., up, down, repeat])
A searchable, editable, and expandable collection of tunes, melodies, and musical themes. (Musipedia)
Shazam (uses 10-second clip of song)
The application can identify music, movies, advertising, and ...
I recently discovered musipedia which describes itself as The Open Music Encyclopedia.
I don't yet know how comprehensive it is but I have found it to be a very good look up tool at least. You don't get a lot of information but you get some links which may be useful.
I have tried it mostly with classical music and, so far, I have not defeated it. I need to ...
Outside of Oxford Music, I'm not aware of any similar dedicated music encyclopedias. Wikipedia is as close as I know of, and it is generally comprehensive if not as authoritative as OM.
The only other encyclopedia-like sites I've found are:
https://www.dolmetsch.com/index.htm: This site appears to be for a commercial early instrument seller, but they have a ...