According to the Harvard Dictionary of Music, a polyrhythm occurs whenever two contrasting rhythms happen at the same time. That doesn't nail things down for us very well, especially given that there are a number of terms used to describe polyrhythms. What adds to the confusion is that the book uses the same bit of notation to illustrate several of these terms. So what gives?Terminology is helpful when it clarifies concepts, and a pain in the butt when it serves only to confuse. So I'd like to offer a few suggestions for interpreting the rather imprecise terms available to describe concurrent rhythms.