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I guess your comment is horsesh1t, but at least it's not cowsh1t although it's still sh1t
Anyway, try tapping or humming along to Shed and you'll find metal is more than just noise.
It can be very technical and takes a lot of musicianship.
If you're still not convinced, listen to some Nightwish or Within Temptation and be amazed at the poppy melodies and opera singing in metal.