Bach, Beethoven, Mozart, Paganini, Brahms, Haydn... etc.
I'm a huge fan of Mozart and Paganini. Of course, the others are great, too.
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Wagner. He's got that German POWA! Seriously though, Wagner's over-the-top style compared to other composers kinda made him the heavy metal guy of his day. Really that's kinda what he was, the heavy metal of classical.1