It really depends on how much damage this new song actually amplifies our attacks by. If it's significant enough to make up for the initial song cast time, loss of auto attacking, and the additional casts to our attacks, then yeah it's probably a really good song to turn on during fights where movement isn't key. I would imagine that you would need a good 15 seconds worth of being stationary in order for it to be worth it though. Unless they're changing it so that skill speed affects song casts.
