So like the .mid file is a file playing a piano cover of Where Is My Mind (which is a banger btw go listen).
But like strings or binwalk shows nothing so confusion hit hard.
I scoured the internet for tools related to .mid file steganography and found one that converts a .mid to a .csv file.
This was called midicsv and literally does what it says.
So I ran that and it outputted a csv file with characters which looked like ASCII characters to the naked eye.
However there were 2 different streams of different ASCII characters.
I just opened up a site which converts ASCII to text and tried both streams.
The first one was nonsense but the second one had distinguishable features to it.
I could see rac and f5soci3 which could be fsociety?
A Mr. Robot reference which ties into Where Is My Mind.
The track played on the .mid file. However not everything was readable.
So I used another ASCII conversion site and I could see the flag clearly this time.