The clarinet is a single reed
http://www.answers.com/topic/woodwind instrument. Clarinets come in many different sizes, with different pitch ranges. Though there are more than a dozen different modern clarinet types, the most common ones used in orchestras and bands are the B flat and A clarinets. The bass clarinet, which is much bigger than the standard and has an upwardly curved bell, is also frequently used in modern bands and orchestras. Other clarinets include the A flat, B flat, and E flat sopraninos, alto clarinets, contralto, and contrabass clarinets. The standard clarinet consists of five parts-the mouthpiece, the barrel or tuning socket, the upper joint, lower joint, and the bell. A thin piece of cane called a reed must be inserted in the mouthpiece before the instrument can be played. Different notes are produced as the player moves his fingers over holes and metal keys which open and close air holes in the clarinet's body.
It is a very clever instrument generally made form wood and it comes in dark blue, grey brown and black.
The notes on the clarinet are also the same as the Bass Clarinet. The lowest note on the clarinet E --- bass clarinet is Eb.
The clarinet is very cool in Manny ways. It is a woodwind instrument. People usually don't forget the notes. So don't freak out during a concert.