A wonderfully engaging and interesting book about a little known area of musical history – the glass armonica. Invented by Benjamin Franklin, written for by Mozart and Beethoven amongst others, used by Mesmer in his experiments, and creating delight and occasionally fear over the centuries, it’s is now apparently enjoying a revival. The book is as much a cultural history as just about a musical instrument and is wide-ranging in its scope, especially for such a relatively short book. Well-written and well-researched, I found it thoroughly enjoyable and appreciated learning something new.