There's been several of us who have played Stevie Ray Vaughn-Tin Pan Alley, which is a great song for a speaker demo. Terrific vocals, guitars and drums place you there in the studio. You can hear the amps humming in the recording!Just a thought here, but maybe everyone should post the same song? That would be cool!
With that said, it would also get kind of boring to hear the same song hundreds of times.