Hello:
I never heard The ABB in concert. I heard Devon Allman, Gregg's son, a few years ago at the London Bluesfest (London Ontario). He covered Midnight Rider and played many other tunes with his band at the time. Wow... Devon is an excellent guitar player!!!
I have The ABB album, Brothers and Sisters, as well as, Laid Back (one of Gregg's solo albums) and Low Country Blues (a more recent work)
RIP GREGG
http://www.facebook.com/greggallman/
http://www.facebook.com/devonallman/