From a PBS Great Performances broadcast in 1995. This has a simple explanation of Wagnerian leitmotifs, specifically in Siegfried's Funeral March and Brunnhilde's Immolation, from the opera Götterdämmerung.
Actually, Hugh, it is EXACTLY like the theme to jaws. The duuuuuh-DUNT thing from Jaws stands for the presence of the danger and of a character (the shark). After all, the "theme" from Jaws is more like a motif than a theme. John Williams use of Leitmotif may be a bit ham-fisted, but it works the same as in Wagner...
I don't get it... if a leitmotif is a recurrent theme that is associated with a specific thing, person, place or idea, then why isn't the Jaws theme considered a leitmotif??? Isn't that also a recurrent theme associated with the shark?
I believe Gluck is cerdited with writing the first leitmotifs for Opera, at least deliberately, maybe others (like Monteverdi) used them in a less systematic manner
Check out wikipedia Strauss_in_Nazi_Germany regarding Strauss. It doesn't seem like he was really a Nazi. There also seems to be some controversy about von Karajan. See wikipedia Herbert_von_Karajan#Nazi_Party_membership
He didn't hide his distaste for Jews. So, I would say, that since he had an extremely anti-semitic opinion, you could consider him a 'nazi.' Maybe the hipster version of it; but since he died before the Nazi regime came about, he doesn't really fit into the category exactly.