Meh. Depends on band/genre. There's Green Day is Metallica's kill em all radio for some reason. I love both bands, but they're not really related.

There's static-x and Korn in megadeth's radio.

If you go to cannibal corpse's radio, out of 2.5 hrs of music/40-50ish songs, you'll see 6 songs by cattle decapitation, 4 of which from the same album. For a genre with hundreds of bands, that's piss poor variety. And ofc bunch of other bands in there there aren't death metal such as slayer or venom.

Sorry, end of rant.