Lol. When i bought my first bass, didn't even plug it in. I was too embarrassed to sound shitty. Plus there was a guy in the guitar section just wailing away on a guitar.
Tearing, by Rollins Band. Mostly because it has a great groove to it and gives you a good idea of the bass's action when it comes to faster-paced stuff. And of course it makes me think that anyone around listening will be like, “ Dude, that guy can play!”
Money by pink floyd is my go to riff on bass. For the guitar I know a sweet fingerstyle version of the entertainer which is always fun to play and is my go-to song for the music store.
I'll usually start with my go-to warm up songs, like Clutch - Elephant Riders, Rolling Stones - Live With Me, or Rush - Distant Early Warning. If I'm testing an effects pedal I usually play Clutch - Promoter. There's also a little run I made up that goes:
This happens to me every time. When I go to try out an instrument I'll have some killer solo or groove in mind but once I touch a bass or guitar everything I know goes out the window. My go-to is usually Master of Puppets or Holy Wars if I ever think of anything