Hoist the Colours
Voiceplay meets Pirates of the Caribbean (and 'breaks the reactors', apparently -- I didn't even know 'reactors' were a thing until I saw the comments, but I suppose it makes as much sense as YouTube channels consisting of people watching other people play computer games :-p And some of those reactions are definitely entertaining...)
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Elizabeth Zharoff (Channel name: "The Charismatic Voice") is another professional opera singer (and vocal coach) who does more intellectual reactions. And she'll also often comment on how certain sounds are created, physically, and whether a singer is performing in a healthy way, or threatening damage to their vocal folds.
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I was hoping she would do one of this song, since I very much appreciated her in-depth look at the various "Nightmare Before Christmas" Voiceplay arrangements, but she hasn't as yet.
One problem I have with her channel is that it can be a bit like hearing someone lecture on modern art: the professor waxes lyrical on the inspirational subtleties of the paintwork and all the imagery involved, and you think you might quite like it after all, and then you see the actual painting again and it still looks like random blobs. I'm still not getting anything from most of the 'alternative' forms of music but screaming and strange noises (although "The Hu" were definitely quite scary...)
My favourite reaction so far was from Mortius, who is apparently an a cappella arranger himself and picked up on several details that the seventeen or so predecessors didn't (in addition to being gratifyingly impressed!)
https://www.youtube.com/watch?v=QCLSEd-FOK0
And after that Qofy, who seems to know what he is talking about and appears to have a pretty decent voice of his own (although the episode of the missing trousers was undeniably amusing too ;-p)
https://www.youtube.com/watch?v=N1vF9-VCvb8