On my recent trip to Europe it was fascinating what songs I'd hear on the radio that had crossed the ocean and seemed to still be in regular circulation on the radio and how the compared to the current regular circulation at home

I will say, GTA's parody radio stations are a really good parody of what radio stations actually play. From your description that rock station sounded pretty similar to any rock stations I've listened to (including specific shows hosted by specific people) although looking into it, I'm realizing that both of the rock stations I've listened to enough to remember are from much smaller conglomerates, one of which is only 4 stations on a single shared tower while the other is a regional conglomerate with a couple dozen stations in 7 markets so ymmv

If you'd like I can pm you the websites since both companies offer internet radio streams as well