Bards are the simplest to multibox by a longshot. My experience 4-boxing both mages and bards is that bards are not particularly exciting or overpowered but they DPS while healing far, far better than even full chloro specs do, provide superb invasion/rift raid support and come with their own pet tanks.
There's a gap in capability between levels 33-45ish where you can't really effectively split-spec ranger/bard/nightblade and get the best of all three but they're still extremely well-suited to boxing effectively.
There are some caveats to my statements above but this holds true for most situations. I'll let other folks respond first before I clarify (if needed).
[edit] Note that secondary-spec pets do not level past 30 without spending the talents to get the "Call Greater xxxxx" spell. This needs to color your thinking as your pet will start getting mauled badly by about level 33 unless you respec for this.![]()
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