By Wayne Erbsen
It’s Saturday night. Instead of relaxing safe at home plopped comfortably in front of your big screen TV, you’ve got your hind quarters parked squarely on a hard folding chair. If that’s the case, chances are you’re either at a festival watching your favorite bluegrass band, or perhaps you’re huddled under a tarp in the pouring rain jamming with friends or total strangers at a fiddlers convention. Either way, you often witness secret or not-so-secret signals or cues from one musician to the rest of the group to alert them that a song or tune is about