Yes both of them have a classical music element.
So did Emerson, Lake, and Palmer for a while. Remember “Piano Concerto Number One by Keith Emerson”?
https://www.youtube.com/watch?v=n3JEaXQ18kA&ab_channel=ShoutFactoryMusic
Of course, one of the greatest fusions of classical and rock is one of Rush Limbaugh’s favorite bands, Mannheim Steamroller. Check out Fresh Aire and Fresh Aire 2.