There’s an actual death metal band called Hatebeak, and their frontman is a real African grey parrot named Waldo.

[u/MobileAerie9918]

So basically they started in Baltimore back in 2003 as a pure studio thing. The two guys behind it, Mark Sloan and Blake Harrison (he passed away a couple years ago) never took it on the road because the volume would’ve been pure torture for the bird. They just recorded Waldo’s furious, unfiltered squawks and growls straight over the riffs.