I've noticed a difference between people from the northbay vs. eastbay as far as music. And even a difference between Oakland and the rest of the eastbay because Oakland for the most part didn't fuck with much outside of Oakland.
If you're from the north bay Mac Dre was on bay rap Mount Rushmore automatically. If you're from the eastbay you either thought he was dope or not, but there wasn't this implied elevation.
It seems like everyone in the bay has a similar base, E-40, Too Short, assorted classic songs/albums etc etc...But then depending on the area that gray area is filled in differently.
Doom with sit there in awe as I have no clue about some obscure (to me) north bay rap song/album/whatever, but that spot in my brain is filled with some Pittsburg/Antioch stuff from that time she has no idea about.
Even outside of music, the variances you notice in people from north, east, south, and SF are interesting.