As others have noted, there is a strong country influence present in Southern rock (but some blues artists can be a bit countrified at times). I have to note (pardon the pun) that most soloing in Southern rock is reminiscent of Celtic/Gaelic music: fast execution of pentatonic major and minor scales within a clearly defined rhythmic conception. Blues artists tend to use dominant scales far more often than the pentatonic major (the blues scale is a hybrid which does has elements of pentatonic minor and its parallel dominant 7th arpeggio) and the approach to rhythm is looser and more interpretive.
With no ad hominem to those who made this statement, lumping the Allman Brothers into Southern Rock isn’t altogether fair beyond the geographical consideration. When Duane Allman was alive that band could play the blues (show me a better reading of “Stormy Monday” than the version from the Fillmore recording!) and whose musical sensibilities even stretched towards jazz (“In Memory of Elizabeth Reed” or “Whipping Post” definitely are worlds away from Lynyrd Skynyrd, Molly Hatchet, or .38 Special). The Allmans would be linked more fairly with Little Feat, Dixie Dregs (later shortened to the Dregs, this outfit sounded like the Allman Brothers crossed with the Mahavishnu Orchestra), or Sea Level (which Chuck Leavell started after leaving the first post-Duane Allman Bros. lineup) if they must be categorized (maybe Southern fried funk or gumbo boogie?),
Again, no offense intended by the rant; just my humble opinion- but one forged from countless hours of listening to and playing music including, but not limited to, the above artists.
You know what? The current dance scene is so full of fusion styles that mix various forms of dance together in the never-ending quest to create something original that the lines have become totally blurred. Basically, ballet lays down the rules of dance and modern tries to find every single way to break those rules, and then there’s everything else in-between. Thus, today’s contemporary ballet is a fusion of ballet and modern. But my daughter has had many jazz and modern teachers that you could barely tell one from the other by observing their classes. It’s really up to the individual teacher to say how they define it.