A countertenor is a type of classical male singing voice whose vocal range is equivalent to that of the female contralto or mezzo-soprano voice types.
Types of Compound Bows. Compound bows are classified by the type of cam system they use (called the bow eccentric.) The most popular types of compound bows on the market are Single Cam (sometimes also called One Cam or Solocam), Hybrid Cam, Dual Cam and Binary Cam. Less common designs like Quad Cam and Hinged are a little harder to find.
Guitar/Different Types of Guitars - Archtop Guitars. 1  The archtop is a semi-hollow steel-string acoustic or electric guitar. The arched table combined with violin-style f-holes and internal sound-block creates a timbre that is acoustic and mellow.