Your music Hubs sound perfectly fine to me. We allow lists of songs, YouTube videos, etc, but the Hubs will have to have enough of your own commentary to be truly unique and useful to your readers (i.e. Hubs that are just lists without any additional explanations are unlikely to pass our Quality Assessment Process).
The one thing you'll probably want to watch out for is that certain keywords in the metal genre (sexual terminology and gore keywords) will not be ad-safe on HubPages. Google tends to be on the conservative side with the content they are willing to show ads on, and without ads you won't be able to earn from your Hub. Just something to keep in mind.
This sounds interesting. I don't think you will violate anything. You can share YouTube videos in your hubs so long as those videos are allowed to be used.
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