Predictable...lack of connectivity in parts.
I found most of this book predictable, many of the characters' actions irritating (much like when you yell at the dumb person in a movie who is walking straight into a killer's lair without so much as a weapon), and unless you have a musical background, the book was (for me at least) difficult to connect with.
While the main character, Sara, is amicable enough, each character around her (a cop with anger issues and an unhealthy relationship with his ex, affecting their children, a drunk ex-teacher that mooches off of her, a gay friend that ping-pongs back and forth between being horribly prissy and having legitimate health complaints just to start) has traits that are more annoying than endearing.
Author also makes the plot predictable, however sometimes fails to connect details that she expects the reader to just pick up on and make assumptions (such as Sara, who studied music for many years in her childhood, and the next thing you know she's instantly famous, performing an incredibly difficult piece half way around the world, having it recorded to be released in stores, etc...). It really seems like the author brings some of the details of the book into view only when it suits her current theme, not being mindful of those details throughout the book.
Ha! Well...that was verbose! It is difficult to articulate well without just opening the book and showing examples! Hope this helps!