This book goes back to a pre rock 'n roll era when jazz was a popular music form.

The early 50s were the time when the big bands were fading a way and the rock'n roll revolution was yet to happen.

A quartet led by a baritone saxophonist caused a revolution. 

 Audiences were entrance by the sound of a jazz group that didn't have a piano in it. This was new - it hadn't been done before.