Sound waves are created coming from the back and front panels as the soundboard is vibrating. The sound box serves as a resonant cavity and reflects the sound waves produced. The sound volume increases greatly compared to the primary volume created by the strings. Some sound is then projected out of the hole. The tensions screws were developed to securely and more firmly hold the snares which gives a brighter and more solid sound. The stand is optional. You may mount the snare drum on the stand or carry it with a strap. The stand has an effect on the sound so don t attach the stand basket compactly against the drums hoops. Tuning could be done by either turning the pegs where the strings were fastened or moving the string s position on the crossbar. Lyre, zithers, and harps Organologists say that the lyre from different periods and areas are all members of the zither family. For your information, organologists specialize in the study of musical instruments history. Accordion The accordion is a handheld free reed musical instrument from the bellows-driven aerophone family. At times, accordions are called squeezeboxes and thought of as a one-man-band. It often does not need any accompanying instrument because the performer could play music on keys using the right hand and the accompaniment which has pre-set and bass chord buttons using the left hand. The most popular brother of the oboe is the cor anglais, more commonly known as English horn, which has the tenor role in the family. This is a transposing instrument pitched in F. The alto role is done by the oboe d amore which is pitched in A. A less popular member of the oboe family is the bass oboe or baritone oboe which is one octave lower compared to the oboe. Compared to the saxophone s, the cone-shaped bore of the octavin has a smaller taper. Construction It has a similar shape with the bassoon with two parallel divisions attached at the base. A bell made of metal is at the top of one division and the mouthpiece is fastened to the other division s top. It is constructed with wood and the only metal section is the bell.