I was locked in place and became infinity and was tortured for like 10,000 years as I saw the last moments before singularity, with rippling interference as the singularity grew and reality shrunk in chunks and waves. Everything stretched thin before me as I saw the undoing of all, and then suddenly I was in my bed with my cat, sticky with dried, melted ice cream cuddled into my arm.
Also I dropped the ice cream and the cat ate it 
Ever since a TBI years ago, any time I hear white noise for a while, this starts happening to me too. Sometimes it's conversations that I can't quite understand, as if they're on a loud TV in the other room even though there's just silence aside from the white noise of a fan or air filter or whatever. They're clear enough I can hear the tone and emotion of the conversation, I can clearly recognize if the person "talking" is masculine or feminine sounding, I just can't pick out their words. If I mix in cannabis and my hydroxyzine meds, that's when I get elaborate music, like full on scores. I get classical music like you sometimes, but other genres as well. Sort of like what AlicePraxis was saying, it can sometimes be weird "extreme" music that I've thought was actually pretty awesome. I've tried to write it down even, but I always lose it in the attempt to do that.
If you don't mind me asking, @AlicePraxis@hexbear.net, is your name a Crystal Castles reference? If so, it's kind of funny because often times it's that kind of enhanced 8-bit "chip tune" sound like theirs that I get in my auditory hallucinations.
Brains are weird.
Yes it is a reference to the crystal castles song, you're the first one to point it out!
I used to get similar auditory hallucinations of peoples voices when I was a kid, usually at night when trying to sleep. In my case they were voices of real people I knew and had talked to that day, but like you I couldn't make out what they were saying, it was like random syllables. It can still happen when I'm really tired or stoned but not as much as it used to.