Note that if the singer is mentally ill but the song is about something else, it doesn't count.
I've seen references to this trope where the song in question actually isn't about insanity at all, nor about anything else, but is used to indicate a loss of sanity, though the only one that comes directly to mind at this time is the example given on the page for Atop The Fourth Wall. This brings up a few questions.
First, is that a valid use of the trope? Second, if not, and if, as it seems, there's no other trope to cover it, could the existing trope be expanded to cover it? It's a perfectly valid use of a nondiegetic or background element that could do with some easy-to-locate listings, but I'm not sure what to do with it as I'm not sure it's quite well-defined enough, or distinct enough from the Sanity Slippage Song, for its own trope, but it also looks like Sanity Slippage Song is crowded as it is without the addition of a variant.
To start with, this line from the Sanity Slippage Song article:
I've seen references to this trope where the song in question actually isn't about insanity at all, nor about anything else, but is used to indicate a loss of sanity, though the only one that comes directly to mind at this time is the example given on the page for Atop The Fourth Wall. This brings up a few questions.
First, is that a valid use of the trope? Second, if not, and if, as it seems, there's no other trope to cover it, could the existing trope be expanded to cover it? It's a perfectly valid use of a nondiegetic or background element that could do with some easy-to-locate listings, but I'm not sure what to do with it as I'm not sure it's quite well-defined enough, or distinct enough from the Sanity Slippage Song, for its own trope, but it also looks like Sanity Slippage Song is crowded as it is without the addition of a variant.