Yeah I share shit with them but I don't force it on them.
Take my friend kyle. He was all about Korn and Disturbed and prettymuch didn't listen to anything outside the radio.
We were hangin out at his place playing some Tony Hawk on his Xbox and I said hey, I got these new cd's and they're pretty cool, wanna try them out?
I played ICed Earth's Horror Show, starting with JAck, he absolutely loved the opening part and just drooled over how heavy and fast it sounded to him. We played Wolf and Dracula and Transylvania and he loved them all.
Next I put in Symphony X's The Odyssey. First 30 minutes of Inferno and he's about to go into a seizure from delight.
Since then he's purchased over 100 albums from bands like Cranium, Iced Earth, Iron Maiden, Nocturnal Breed and so forth.