An Equal Music...

has anyone read this book? I just checked it out of the library and I wanted to hear if anyone has read and what they think of it before I start actually reading it.
And has anyone read the Mortal Insturments series? I am on the last one but haven't started it yet. If you've read it could you please tell me if it was as good as the other or if it's awful or just whatever.
kay, thanks interwebers :)