After reading Dave Runnion and Chris Bonds on the subject, I just had to check precisely what a frog is in this context, never having heard or seen the term before. This led me to the section on bows in The New Grove, which contains all anyone could reasonably want to know on the subject, including photos and drawings. My dictionary tells me that apart from the obvious, there are a number of other meanings of "frog", none related to music. It'd be fun to know of other arcane or familiar words used to describe various bits of different instruments. Richard Pennycuick [log in to unmask]