ZZ Top might seem like something of a challenge for the VH1 "Storytellers" series because while this Texas blues-rock band has a secure spot in music history, its three members don't have a reputation for being all that chatty. Billy Gibbons and Dusty Hill - the two bearded guys out front - are droll and funny. So is drummer Frank Beard, the one without a beard. But they've mostly let their music talk over the 40 years they've been playing together. This show comes across more as a ZZ Top greate...