Or at least in excess of 80% of the tracks?
Hate Songs in E Minor, Fudge Tunnel.
There are probably hardcore and metal bands who have never played a song in a major key.
Yeah, I was gonna suggest that you’d have a hard time finding any heavy metal that wasn’t in a minor key.
IIRC from the sheet music I’ve seen, Prince tends to write in B-flat minor, but I haven’t seen what I would consider to be a representative sampling.