This isn't meant to denigrate DPS or tanks. Heck, I'm a tank or DPS more than I'm a healer nowadays. But I believe strongly that healing is the silent motive force for a successful run, that a great deal of the pressure is placed on a healer's shoulders without the showy nature of the tanking role or the meter busting fun of the DPS roles. Healers are like the drummer, often ignored, but absolutely vital.
So here's your chance to agree or disagree, as well as to go even further. Are DPS the guitar? Is the tank the bass player? Have I gone completely insane? Do we even need that last question?