Personally, I mainly solo play, so singing is like a godsend to me. Now I can buff up with both Beserk and Overture for maximum overkill! May as well throw a Weapon Potion or Bone Dragon Chip on top of that.
I'll be able to easily have full access to fighter/magic with the new Sulien Knuckles (at the sacrifice of damage), access to Melee via my usual dual wield stuff, and then access to Bard skills via Singing all with just 2 weapon slots :D
Yeah. I'm planning on Savaging+Hermit for general versatility and then full magic access. So Singing is great for me, too.