If you are looking for a "muscle-mag" answer, this would be the one:
Back-
1.Upper- Pull-ups (wide grip, behind the neck), machine pull-downs, machine pull-overs (or straight arm pull-overs with bar)
2.Lower- Close grip pull-downs, reverse grip pull-ups, close grip cable rows.
3.Middle- Bent-over barbell rows, wide grip cable rows, dumbbell rows (one or both hands at once).
4.Lower- Deadlifts (straight leg or not), hyperextentions.
5.Traps- Barbell shrugs, dumbbell shrugs, upright rows, deadlifts.
This was taken from the Arnold S. encyclopedia. His views reflect the steroid age of bodybuilding...Prefatigue sets, tri-sets, high volume. Some people do respond to high volume..A very few...But for the vast majority, it doesn't.
If you really want a bigger back, you need to increase the frequency well beyond the traditional "I blast my muscle once every seven days"
.. If you were to work your back hard 2-3 times a week, you'd be amazed.
To summarize, if you do 1-2 muscles per day with a once a week frequency, you'll "benefit" from 52 growth cycles in a year. But, if you work your muscles twice a week, you'll go through 104 growth cycles in a year...See where this is going? If science is applied to bodybuilding instead of muscle mags, the world would be an bigger place. Refer to the Hypertrophy-Specific Training thread for more...