Well my Jack Black impression could use some improvement (apart from the 'devil voice' I guess), but I sure had fun with it.
Usually when I try to sing as high as Jack's high note after "ROCK!", my voice cracks like the squeaky-voiced teen from the Simpsons unless I'm doing falsetto. I'm still not really sure how I pulled it off like this here - sure, it's still audibly strained, but at least it doesn't sound like bloody puberty, which is kind of a first.
Also, shoutout to whoever phonetically transcribed the gibberish scatting part on the song's Genius page - that helped a LOT
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