Sorry for being so late with these. Yesterday was manic, but better late than never.
The first two numbers are
2. Banjo
The banjo is a (usually) four-, five- or six-stringed instrument with a thin membrane stretched over a frame or cavity as a resonator. The membrane is typically a piece of animal skin or plastic, and the frame is typically circular. Simpler forms of the instrument were fashioned by Africans in Colonial America, adapted from several African instruments of similar design.
The banjo is frequently associated with country, folk, Irish traditional and bluegrass music. Historically, the banjo occupied a central place in African American traditional music, before becoming popular in the minstrel shows of the 19th century. In fact, slaves were both influenced by and influenced the early development of the music, which became country and bluegrass, particularly in regards to the innovation of musical techniques for both the banjo and fiddle. The banjo, with the fiddle, is a mainstay of American old-time music.
There are several hypotheses as to the origin of the instrument. One suggests that it descended from the kopuz, a string instrument still in use among the Turkic peoples of Central Asia and the Caspian region. The name itself derives from the Arabic tunbur, which in turn may have descended from the Sumerian pantur. There are several theories concerning the origin of the name banjo. It may derive from the Kimbundu term mbanza. Some etymologists believe it comes from a dialectal pronunciation of the Portuguese "bandore" or from an early anglicisation of the Spanish word bandurria, though other research suggests that it may come from a West African term for a bamboo stick formerly used for the instrument's neck.
Various instruments in Africa, chief among them the kora, feature a skin head and gourd (or similar shell) body. The African instruments differ from early African American banjos in that the necks do not possess a Western-style fingerboard and tuning pegs, instead having stick necks, with strings attached to the neck with loops for tuning. Banjos with fingerboards and tuning pegs are known from the Caribbean as early as the 17th century. 18th and early 19th century writers transcribed the name of these instruments variously as bangie, banza, banjer, and banjar. Instruments similar to the banjo (e.g., the Japanese shamisen, Persian tar, and Moroccan sintir) have been played in many countries. Another likely banjo ancestor is the akonting, a spike folk lute played by the Jola tribe of Senegambia, and the ubaw-akwala of the Igbo. Similar instruments include the xalam of Senegal and the ngoni of the Wassoulou region including parts of Mali, Guinea, and Côte d'Ivoire as well as a larger variation of the ngoni developed in Morocco by sub-Saharan Africans known as the Gimbri.
The modern banjo comes in a variety of forms, including four- and five-string versions. A six-string version, tuned and played similarly to a guitar, has gained popularity. In almost all of its forms, banjo playing is characterized by a fast arpeggiated plucking, though there are many different playing styles.
The body, or pot, of a modern banjo typically consists of a circular rim (generally made of wood, though metal was also common on older banjos) and a tensioned head, similar to a drum head. Traditionally the head was made from animal skin, but today is often made of various synthetic materials. Most modern banjos also have a metal "tone ring" assembly that helps further clarify and project the sound, however many older banjos do not include a tone ring.
The banjo is usually tuned with friction tuning pegs or planetary gear tuners, rather than the worm gear machine head used on guitars. Frets have become standard since the late 19th century, though fretless banjos are still manufactured and played by those wishing to execute glissando or otherwise achieve the sound and feeling of early playing styles.
Modern banjos are typically strung with metal strings. Usually the fourth string is wound with either steel or bronze-phosphor alloy. Some players may string their banjos with nylon or gut strings to achieve a more mellow, old-time tone.
Some banjos have a separate resonator plate on the back of the pot, designed to project the sound forward and give the instrument more volume. This type of banjo is usually used in bluegrass music, though resonator banjos are played by players of all styles, and are also used in old-time as a substitute for electric amplification when playing in large venues.
Open-back banjos generally have a mellower tone and weigh less than resonator banjos. They usually have a different setup than a resonator banjo, often with a higher string action.

See and hear the
banjo being played.
24. Sousaphone
The sousaphone is a brass instrument, related to the tuba and helicon. It is widely employed in marching band and tanjidor. Designed so that it fits around the body of the musician and is supported by the left shoulder, the sousaphone may be readily played while being carried. The instrument is named after American bandmaster and composer John Philip Sousa, who popularized its use in his band. The sousaphone was developed in the 1890s at the request of John Philip Sousa, who was grumpy with the hélicons used at that time by the United States Marine Band. The first sousaphone was either developed by J.W. Pepper, in 1893, or by C.G. Conn, in 1898. The hélicon is an instrument that is wrapped in a helical shape and can thus be worn around the player's upper body, facilitating marching activities. Most tuba-sized hélicons have a bell which points between straight up and to the player's left, and the bell is similar in size to that of a common European-style upright tuba. Sousa wanted a tuba that would send sound upward and over the band with a full warm tone, much like a concert (upright) tuba, an effect which could not be achieved with the more directional hélicon bell position. The new hélicon requested by Sousa would have an oversized bell pointing straight up, but otherwise would be like a normal hélicon. Contrary to popular belief, the sousaphone was not initially developed as a marching instrument, as the professional band Sousa started after leaving the Marines (for which he wanted this new instrument) marched only once in its existence. Rather, Sousa wanted a concert instrument which would be easier to hold and play, while retaining a full, rich sound. The tone he sought was achieved by widening the bore and throat of the instrument significantly, as well as pointing it straight upward in a similar manner to concert instruments, a feature which led to the instrument being dubbed a "rain-catcher". Some versions of this design allowed the bell to also rotate forward, projecting the sound to the front of the band. This bell configuration remained the standard for several decades. Versions with the characteristic extra 90° bend making a forward-facing bell were developed in the early 1900s. Early sousaphones had 22-inch-diameter (560 mm) bells, with 24-inch (610 mm) bells popular in the 1920s. From the mid-1930s onward, sousaphone bells have been standardized at a diameter of 26 inches (660 mm). Some larger sousaphones (Monster, Grand, Jumbo, or Giant, depending on brand) were produced in limited quantities.
The sousaphone is a valved brass instrument with the same tube length and musical range as other tubas. The sousaphone's shape is such that the bell is above the tubist's head and projecting forward. The valves are situated directly in front of the musician slightly above the waist and most of the weight rests on one shoulder. The bell is normally detachable from the instrument body to facilitate transportation and storage. Excepting the instrument's general shape and appearance, the sousaphone is technically very similar to a standard (upright) tuba.
Most sousaphones are manufactured from sheet brass, usually yellow or silver, with silver, lacquer, and gold plating options, much like many brass instruments. However, the sousaphone (uniquely) is also commonly seen manufactured from fibreglass, due to its lower cost, greater durability, and significantly lighter weight. Today, the fibreglass versions are mainly used for marching, with brass instruments being used for all other situations. In schools that cannot afford two kinds of tuba for each player, having only the sousaphone type is common. Depending on the model, the fibreglass version normally does not have as dark and rich a tone as the brass. Regardless, fiberglass sousaphones are lighter than their brass counterparts and work well for smaller players who could not otherwise play the heavy brass instruments in a marching band. Although the tone of fiberglass models tends to be thinner and less "warm" (earning them the nicknames "Plastic Bugle", "White Trash", "Toilet Bowels", and "Tupperware" among players in some ensembles), it is considered acceptable by the high schools in which the instrument is most common due to the trade-off in durability, cost, and weight. Despite the disdain of sousaphones held by most serious tuba players, a quality modern sousaphone is often a better choice for the high school or semi-pro player due to more stable intonation and less breath effort needed to generate tone.
In large marching bands of the United States, the bell is often covered with a tight fitting cloth, called a sock, which enables the sousaphone section to spell out the school's name, initials, or mascot. The Leland Stanford Junior University Marching Band Tööbz! have a tradition of painting the front surface of their Sousaphone bells with a variety of images.
Sousaphone players are also known to perform the 'flaming tubas' in which flash paper is ignited in the bell, thus making it appear as if the musician is breathing fire. David Silverman (AKA Tubatron ) developed a propane powered flaming Sousaphone with a trigger valve to control an array of flame jets across the top of the bell of his horn. The Yale Precision Marching Band has made a tradition of setting fire to the tops of the bells of their sousaphones, including in the autumn of 1992 when sousaphones served as the "candles" of a "wedding cake" formed by the band when two band alumni were married during a halftime show. They also utilize what they refer to as the "Überphone", a sousaphone that was disassembled from its coiled format and welded back together on a twelve-foot frame to extend straight up from the player's shoulders.

See and hear the
Sousaphone being played.