It definitely is, assuming there's no limit to how many people you can have assisting on a Perform check. You're looking at three hundred plus before you factor in your own bonuses, although you have to tote around a small cathedral everywhere you go and spend two bardic music attempts a pop.
If you're working with a flesh golem, as long as it can't be killed within a single round, it's effectively immortal. Then again, flesh golems aren't great even with that backing them up, since they have an actual mechanic for how long they take to go off the deep end. (You could calm it down, most likely, but let's face it: It's not worth the trouble.)
There are probably other creatures that absorb electricity damage like that.
Also, the sublime chord gets the ability to do the same thing in a burst at 10th level, although it's a generic "damage" with no type.