I think the blues influence is pretty obvious, but only in certain metal. Black Sabbath was a blues band before they were called Black Sabbath. Just listen to the harmonica in "Wizard", or the saxophone in "Breakout".
As for the classical, Yngwie Malmsteen has been the master at infusing classical sounds into metal. Then again, a whole set of Scandinavian and Dutch bands have been doing classical influenced metal recently. See Symphonic Metal. The first band in that genre I'd recommend is Nightwish.
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As for the classical, Yngwie Malmsteen has been the master at infusing classical sounds into metal. Then again, a whole set of Scandinavian and Dutch bands have been doing classical influenced metal recently. See Symphonic Metal. The first band in that genre I'd recommend is Nightwish.