Even though Bob would like you to think things have changed radically since the 60s that is not the case at all. Mastering back then maximized the resulting recording in the analog world as it does now in the digital world. Effects and editing also prevailed in analog recording .... it is simply easier to do in the digital domain but the the result is the same.

Sure using pitch correction software is convenient but the result is no different from dropping in the vocal phrase 50+ times until the singer gets it right. The recording process in essence hasn't changed at all it's just got easier that's all.