Seeing as how it has a warsat design i have a good feeling that the music its talking about is referring to Rasputin. In addition to that I remember hearing a weird line after playing back some recorded footage of the Cayde-6 stealth drive finding mission (for Youtube stuff). It said something about "soothing the ballet"
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Pretty sure youre right. First thought that jumped into my mind was that building on top of the long hill in Dockyard, the one that leads down into rasputen's bunker.