A canon is a musical composition in which the voices begin one after another, at regular intervals, successively taking up the same subject. It either winds up with a coda (tailpiece), or, as each voice finishes, commences anew, thus forming a perpetual fugue or round. It is the strictest form of imitation. Research Canon
A hurdy-gurdy is a musical instrument of ancient origin, popular among most of the European nations during the 19th century. It consists of a flat rectangular sounding board, upon which are stretched four to six strings of catgut or sometimes wire, two of which are carried directly to the tailpiece, and tuned in unison, and one or both are stopped by a simple apparatus of keys, which shortens the vibratory length to make the melody. The strings are set in vibration by the friction of a wooden wheel charged with rein and turned by means of a handle at one end. Research Hurdy-Gurdy
In music, a tailpiece is a piece of ebony or other material attached to the lower end of a violin or similar instrument, to which the strings are fastened. Research Tailpiece
 
The Probert Encyclopaedia was designed, edited and programed by
Matt and Leela Probert