What is it?
I would prefer to let others tell you whether the product is good or bad (since I am the author) but I can at least tell you what I tried to put into it. The blurb at RPGNow isn't very specific, but it gives you some idea.
I was REALLY disappointed a couple of recent products purporting to deal with Bards and thought, "I can do better..." so I have tried to do so.
If you are looking to get more info on specifics, post here and I'll see what I can do to answer your questions.
Suffice to say that it mostly started with an idea for a prestige class (the sound mage or sonomancer) and two questions: (1.) Why are bard abilities so limited in scope and (2.) Exactly how far away can a bard be heard, anyway?
I tried to broaden the scope of bardic abilities and I hope I succeeded. I also hope I did a better job of codifying with "hard and fast" rules how the abilities work in a way that looks a little more like spells.
Having gotten a set of ideas that I wanted bards to be able to do and having developed a relatively easy framework of rules to do it in (that remains consistent with the PH), the book almost wrote itself after that.
Again, if you have more specific questions, drop me a line here. If you want comments on the quality of the work, ask someone else... of course I will tell you I did a good job, but my motivations are somewhat in question since I *AM* hoping to sell copies of the thing.
--Spencer "The Sigil" Cooley