I needed a bit to get into it, but after a while it became a pageturner I couldn't put down (despite editing flaws).
The viewpoint characters are Aerie, a bassist joining a rather strange band, John, stay at home stepdad and neighbour of that bands usual "stage", and Donnie, the priest that ends up, at John's wife's insistence, to get rid of the demons that must be behind that horrible noise...
The book keeps the question which side is right - has Aerie been drawn into Bad things, or is the religious faction hysteric? - open for a long time, and even at the resolution doesn't reduce either to cardboard-cutouts. Thhings that I found really fun to read were the pragmatic attitudes of most of the "exorcists" to their holy-magical job, and the interaction between Aerie and her bandmates; generally there's a neat cast of secondary characters with personality in this book.
I had the feeling it let up a bit towards the end; mostly a romantic subplot I'm not sure was supposed to be absurd and funny, or taken seriously. Anyway, romance doesn't take up much of the book.
The book should have had someone else proofreading. There are missing quotation marks, comma mistakes, dropped words, or the kind of mistakes you get when you have two possible versions of a sentence in your mind and write down a combination of both. However, this wasn't so common and bad that the "I want to know what happens next!" factor didn't pull me through.
Formatting was neat for the most part; one page or so towards the end had a slightly bigger fontsize, and there was an empty page before each chapter heading.
Being not a music buff myself I have no idea if the parts of the book talking about music and instruments sound well done to someone who is familiar with the subject. Apart from the very start, I did not find them distracting or in the way of the story despite my unfamiliarity.
I'm pretty sure I'm going to re-read this, and would pick up a sequel if it happened.
(reviewed 12 days after purchase)