The mando-bass mandolins are tuned similar to a double bass and have four strings. Unfortunately, this instrument is quite uncommon. The octave mandolin produces sound which is one octave under that of the mandolin. It is also referred to as mandole and has a scale length of approximately 20 inches. The sopranino or piccolo mandolin is pitched an fourth of an octave higher than the mandolin. The tube, 2.79 m (9 ft 2 in) long, is bent to make a height of 1.22 m (4 ft) and consists of a metal crook on which the reed is placed and four sections of maple or pearwood: the tenor, the butt, the bass, and the bell. Bassoons in modern ensembles Two bassoons are typically required in today s symphony orchestra with the first used in solo passages. Now, accordions have the ability to switch with ease between two voices and are constructed in various methods to increase durability and stability. Construction The accordion has three universal components body, pallet, and bellows and many other parts that are variable. The body is made of two wooden boxes joint by bellows. The rim is the circular edge or lining where the head and other parts of the snare drum are attached. The head is the stretched animal skin or mylar plastic which produces sound when struck with the drumsticks. The tensions screws were developed to securely and more firmly hold the snares which gives a brighter and more solid sound. As stated, piccolos produce notes an octave higher than the flute and it music is written one octave below its pitch. It would also be better to practice with an electric tuner. Observe how long you can be consistent with the rhythm and can hold the note steady. Of course, always tune before playing and practice a lot of times. The clavicytherium has its strings and soundboard placed perpendicularly in front of the player just like the upright piano. On the other hand, the spinet has its strings set at a 30 degree angle from the keyboard. The folding harpsichord is the version of the harpsichord that is suitable for travel.