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The tuba is a conical bore brass instrument which varies from 12 to 18 feet in length.

The colloquial tuba has forms including the sousaphone and other helicons and the concert tuba. A tuba whose tubing is wrapped into an elliptic shape to be held in the player's lap is often referred to as a concert tuba or simply as a tuba. Another common tuba design involves wrapping the tubing around the player's body is known as a helicon, the most popular of these designs is the sousaphone.