I definitely get the two song angle because there’s always just one or two non-negotiable tracks you’re hot to run as test tracks. I’m probably dating myself when I choose Clapton’s Signe as something good to warm up the ears before I get serious with Old Love (’buh buh buh buh...old love...’) from Unplugged and Kurt Elling’s Downtown from Live In Chicago.
I don't want to be one of the predictable old guys walking around with Diana Krall discs, but her No Moon At All from Turn Up The Quiet is an extremely well recorded test track. Back in the ’90s and early 00s when you can hang in audio salons (when there were actually were audio stores to hang in) I remember hearing a lot of Rebecca Pidgeon’s Spanish Harlem and any track from Eva Cassidy Live At Blues Alley.