Do you long to understand the inner workings of the accordion? Are you puzzled by the viola d'amore and its place in the family of stringed instruments? Do you think that "crwth" is a typographical error? You can have almost any imaginable question about musical instruments--Western and otherwise, ancient and modern--answered with a quick look through The New Grove Dictionary of Musical Instruments, an exhaustive three-volume reference work that will tell you, for example, that the crwth is a Welsh term for a plucked or bowed lyre. (It doesn't, however, offer a pronunciation guide in such cases, which would be helpful.) While aimed primarily, in terms of price and breadth of content, at libraries and music professionals, this is a fun set to have around for almost any dedicated music lover.