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 found one article that might be promising. I accessed it through the online database Academic Search Premier, through my University library.
Beaster-Jones, Jayson. “A.R. Rahman and the Aesthetic Transformation
of Indian Film Scores.” South Asian Popular Culture, vol. 15, no. 2/3,
July 2017, pp. 155–171. EBSCOhost, doi:10.1080/14746689.2017....
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 ...
Rick Allen, one-armed drummer for Def Leppard
Tony Melendez, Mark Goffeney - well-known independent "foot guitarists"
The Blind Boys of Alabama, The Blind Boys of Mississippi - Two (very) long-running black gospel groups with blind members. Although they are/were independent, unaffiliated groups, they got their similar ...
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 ...
Allowing you're still looking for an answer...
There's an article on Metastasis specifically, in French, on JSTOR:
Anne-Sylvie Barthel-Calvet. "MÉTASTASSIS-Analyse: Un Texte Inédit De Iannis Xenakis Sur Metastasis." Revue De Musicologie 89, no. 1 (2003): 129-87. Accessed July 11, 2020. www.jstor.org/stable/4494838.
JSTOR is a good place to search. ...