Favorite song to demo or test drive speakers?

I use

Sultans of Swing - Dire Straits
Everything in its Right Place - Radiohead

Definitely Accept “Balls to the Wall”!!!🤘

Stevie Ray Vaughan “Tin Pan Alley”!!
on vinyl 

Crazy by Vincent Ingala
Watermelon Man by Herbie Handcock
Dust by Healos - Bass Demo
Diana Krall for mid voicing

My general advice is to pick songs that:

1) You know really well 2)That consistently provide a visceral reaction (goosebumps, adrenaline rush or an out of body experience, etc). 3) Has an aspect that you think your current speakers don't handle well (piano, female vocals, drums and/or cymbals, etc).

A few songs that meet some of the above criteria for me are:

DADA: "Dorina"
DIXIE DREGS: "Ice Cakes"  
EMMYLOU HARRIS & LINDA RONSTADT: "Sweetspot"
VICTOR KRAUSE: "Shine On You Crazy Diamond"
PREFAB SPROUT: "Faron Young"
STRANGLERS: "European Female"