DonnerWetter!
There are more than just superficial similarities between the riffs of old-school Metallica and many of Wagner's leitmotifs. You can sense Wagnerian drama in Ride the Lighting and you can hear metal avant-la-lettre in the overture of Die Walküre. Sturm ... coming from the large orchestra that Richard Wagner used to create his fantastical world of sound ... und Drang coming from the quartet, armed with weapons of mass distortion, that is Metallica.