Those are: (Chaos King, Scarlet Forest)

Most likely

I think you should be fine. just make sure you keep audio to the rest and you should be fine

you can use music mods for any song apart from mansion.ogg and cyber.ogg

alright, I'm just going to publish the video as is for now.

The rules require you to have audio for all the run.

I dont agree with just muting out long parts of the run. I havent seen youtube mute out parts itself and yeah you can use music mods

If it's the cyber world song being claimed, I just disputed the content ID claim and it was released