It seems that most musicians I know have their "go to" riffs when they are soundchecking their gear before a show or even rehearsal.
It probably has something to do with hearing a familiar riff sounding killer on our rig that reassures us that we are dialed in.
So, what are your "go to" soundchecking riffs?
For years now, I usually play AC/DC's "Walk all over you" (E G D A) or "If you want blood" when I'm in standard. I think it's those big, wide open distorted chords that let's me know if the rig is ready to rock. If it sounds great with that, everything else will be on point.
For Drop D, it's usually VH's "Unchained" because of the chug factor & an excuse to kick on that swooshy flanger. The audience's ears usually perk up as well.
Whitesnake's "Crying in the Rain" and Lynch Mob's "Wicked Sensation." Those to make sure harmonics and rhythm tone are on point.
The Winery Dogs "I'm No Angel" to make sure all those bends are in tune.