Yea, if you paid attention to the whole live letter what they did was add a reason for range DPS to stand still and not run like chickens with their heads cut off.
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It sounds like the new song will probably be used more often for AoE attacks since the Bard's auto attack is pretty powerful when coupled with their buffs. I could see a Blood 4 Blood + Wanderer's Minuet to deal excessive damage, but otherwise the boss you'd use it on would have to be standing completely still in order for it to be beneficial. Skill speed will definitely be more important for Bards though, and I think that may have been their original intention.
Either they're wrong or we can't auto attack while running. No auto attacks would make Barrage a useless ability, in the literal sense.
Edit: Hm, if he says that then that worries me. Barrage is best used with blood for Blood and Hawk's eye, so "Putting all your abilities on and going nuts" is definitely out of the question.
if you can swap on the fly between the song and not having the song, I can see a LOT of tactical viability and I'm actually a little giddy at the possibilities.
If it amplifies damage, this means you activate it to set your DoTs, then swap out of it when mechanics come your way, then back in during "safe spots"
It also looks like it might give Skill Speed viability if they make the changes they said they were going to (which was a nebulous "We r teh changin it")
This is honestly the only buff BRD was missing. BRD is going to be epic now! :)