I think this was a nice find; here is the summary text from Steve La Cerra, the front-of-house engineer for Blue Öyster Cult.
http://mixonline.com/livesound/applications/audio_vocals_road/
What do disparate styles of music such as R&B, country, rap, rock and opera have in common? The money channel is always the vocal. To be a successful engineer, you've got to make the lead vocal sound great. Having mixed more than 1,000 shows for Blue Öyster Cult during the past 12 years, plus working with vocally oriented artists including Firehouse, The Lizards, Patty Smyth, Danny Rodriguez and ClosEnough, I've learned a few tricks for putting your money where your mouth is, even when there isn't enough money in the P.A. system! Let's examine techniques for ensuring that the vocal channel is, in fact, where the money is.
http://mixonline.com/livesound/applications/audio_vocals_road/