I got this piece of sheet music as part of an online game[?], called the Church of Higher Truth can you identify it for me?
It was presented as a puzzle to solve, along with this text:
"Name this song, and give me its meaning. This song is a prelude to the things to come, and it's important to know what to expect. Sing it, play it, and dream it."
The overarching context of the game (or is it not a game?) is that reality is not what we think, and those in power have been lying to us and we need to wake up.