@RustyCrab maybe the instrumentals? Depends on the song obviously. A metronom could write a rap-beat lol.
Vocals absolutely not. We cant even get normal talking right.
For everything in between... I think there is a lot that goes into a song that isn't just melody. Things that people don't consciously notice. Like the metal song you posted, lacked a certain texture or identity. It was too generic to be memorable.