When I was in grade school, they had someone come almost every year to entertain up by playing singing glasses, also called the glass harp (which I learned from reading this book). It amazed me. I had never heard of a glass armonica and definitely didn't know Ben Franklin invented the instrument. The Glass Harmonica is historical fiction and a pleasant read. I like the switching back and forth between time periods and appreciate that the two stories are parallel, yet intertwined and finally converge; a bit of paranormal. I have since looked up more about the glass harmonica and watch some videos of musicians playing the instrument. Music is the key that ties everything together.