It isn’t easy trying to write about a band like ZZ Top. What can you say about the band that hasn’t already been said? The longtime Texas troubadours of blues-based rock are the definition of iconic. Just saying the name ZZ Top is enough to make most people smile, because their influence spans generations. To those precious few that know nothing about these rock ’n’ roll hall-of-famers, I’ll say this: If you want to see one of best, if not the single greatest, American rock party bands of all time, don’t miss ZZ Top’s performance Thursday, Aug. 13 at Innsbrook After Hours. Opening for the bearded legends will be Southern country rockers Blackberry Smoke from Atlanta. Gates open at 5 p.m. Ticket prices vary. innsbrookafterhours.com.