Here's a thread for people to post some examples of fusion between classical and non-classical. It can fusion in terms of just a classical kind of sound, or non classical works that "quote" classical tunes.
Here are a few that I like:
I love this take on that famous Paganini Caprice, "Paganini Rocks" by Robortom & Au Revoir Simone:
Kanye West's song "Ham" which combines rap with a bit of choral/operatic stuff towards the end. I wonder what the diehard rap fans are making of this? I'm not hugely impressed with this, I don't think it's one of his best.
& this is an ancient one from the '70's, "Land of the make believe" by Chuck Mangione. It's basically a fusion of jazz and classical styles. Look out for Mangione's awesome trumpet solo:
& also ancient, Miles Davis' truly classic rendition of Rodrigo's Concierto de Aranjuez: