Texas is part of the south no matter how much Yankees whove moved there swear otherwise
Ive argued that here forever.
Like the origin of the Lone Star flag and so forth
Ill grant ZZ Top is different in a way Skynyrd and Molly Hatchet are similar
Liberals adore Drive By Truckers as Southern rock ..well because its a very lib and I mean Uber liberal band....but its not southern rock to me although the south is all they sing about
Blackberry Smoke is a Georgia band identified with Texas but is very southern rock sounding...
Its kind of complicated.
I even videoed them playing Led Zeppelin -
Producers often take musicians in a different directions or enhance their sound. Think Chess (Cadillac) records with Muddy Waters, Howlin Wolf, and so many others. Then there is producers Phil Spector and Barry Gordy of Motown. Hell, Elvis was a nobody until Sun Records produced him.