That key change, fleeting though it was, added something. Nick caught Jack's eye and raised his eyebrows then smiled to see the nod. Zack and Deacon also nodded and on the next repeat Zack also made a small modification.
Nick laughed. "Keep 'em coming," he called.
This was it - this was what he had missed. Only a mediocre drummer himself, yet he was aware that his steadiness provided the foundation upon which the others could build towers.