Is it from a live-action musical film?
Charlie Stross's cheerful, optimistic predictions for 2017, part one of three.It is not from a live-action musical film.
It is not a Disney song.
ERROR: The current state of the world is unacceptable. Save anyway? YES/NOThe musical is available on CD.
I don't think it falls under the category of "light opera".
ERROR: The current state of the world is unacceptable. Save anyway? YES/NOIs it a Vegas-style musical show (Cirque du Soleil and such)?
Charlie Stross's cheerful, optimistic predictions for 2017, part one of three.Cantata? (That would be stretching the definition of "Musical", but I'm not one to talk, considering how the Tenth Anniversary Concert is technically a cantata-style performance.)
Charlie Stross's cheerful, optimistic predictions for 2017, part one of three.The musical is not a cantata.
I did not really expect the genre to be so difficult to guess...
ERROR: The current state of the world is unacceptable. Save anyway? YES/NOInternet musical?
(Well, we already covered films and traditional stage plays...)
Charlie Stross's cheerful, optimistic predictions for 2017, part one of three.It is not an internet musical.
Insofar as I am aware the musical is only available on CD. (Or other auditory product, I suppose.)
ERROR: The current state of the world is unacceptable. Save anyway? YES/NOIt is an album musical.
Not that that narrows it down much from the previous answer.
ERROR: The current state of the world is unacceptable. Save anyway? YES/NOHas it ever been adapted into a staged or filmed musical?
Charlie Stross's cheerful, optimistic predictions for 2017, part one of three.Was it released during or after 1990?
Charlie Stross's cheerful, optimistic predictions for 2017, part one of three.Yes.
I don't believe so, though that is hardly my area of expertise.
ERROR: The current state of the world is unacceptable. Save anyway? YES/NORock? (not that it would narrow the field much)
Charlie Stross's cheerful, optimistic predictions for 2017, part one of three.

It is not from a staged play.
It is not from an animated film.
ERROR: The current state of the world is unacceptable. Save anyway? YES/NO