I teach for a living, and my students keep coming back for more, and do you know why? Because I tell them what other teachers don't want to tell them so that they'll think they have improved...
I just know what it takes to be a pro, and when it comes to gigging, you can take 'rock discipline' and use it for toilet paper, for it will be your rythm that will make you get in the band. (Only the timing? Well, not everyone can hear a note that's a little sharp, but anyone can hear that you hit the note a quarter note too early or too late).
Last time I was attending the balance of a talent show, and the engineer turned around to me and said 'those groups aren't groups, they're only individuals playing together, or against each other sometimes...'