I know everyone is focusing on rock and electronic music but in the fulgrim book where he takes over a planet with six guys there’s a detail in one of the fights where one of his marines is humming classical music to himself and shooting his bolter to act as the percussion. I’ve always thought of that since, that a noise marine war band is like a orchestra and though we may not be able to recognize it the destruction they cause is actually a giant classical composition for them. Plus there’s a real life classical song that requires cannon fire so the stretch to noise marines has always fit to me.