For years, bands have scratched messages into the run off grooves of their records. I first noticed it on punk/hardcore records in the '80s. It was cool to suss out the shit cause it made the band seem that much MORE in the know and connected to who they were playing to.
Here's Bl’ast's message from their Power of Expression LP...what does it MEAN!?!
Side A: I DIE LAUGHING AT YOU WHEN YOU LAUGH AT ME Side B: SCREAM FOR TOMORROW
If you have time to eyeball THIS PARTIAL LIST of matrix messages do it, it's a time suck, but entertaining! Please add any other found matrix messages in the comments!