Basically any track by Tupac, Nas, NWA, Ice Cube, Eminem, Jay Z. That's got to be at least 50 off the top of my head. I'm sure if I actually thought about it I could give you a couple thousand more. I would put ICP in the Nick Cannon category.
Steady Mobbin aint a diss track. Dear Mama aint a diss track. If I ruled the world is not a diss track. Thtas just off the top of my head. If I did a little more research, I'm sure I could find more.
When Jay Z and Linkin Park did a collab, none of those were diss tracks.
Are you sure you know what a diss track is? I don't think you do.