What's better than a great guitar tech? A great one that also has the chops to fill-in when you can't do a concert. That was the case for ZZ Top bassist Dusty Hill Friday night (7/23). The Texas trio had a date in New Lennox, Illinois but Dusty was out of contention due to a hip injury. Billy Gibbons and Frank Beard called on the band's longtime guitar tech Elwood Francis to pinch hit on bass and slide guitar, and he even played harmonica during the set.