It has a yoke which includes a crossbar and two arms and has strings that stretch from the tailpiece to the crossbar. Some lyres are bowed while most of these are plucked. It is regularly played by strumming with a pick similar to a guitar rather than plucking it like a harp. Based on Greek mythology, the lyre was made from a khelus or tortoise shell covered with horns of the antelope and animal skin by Hermes. The different stringed instrument families evolved from this. In the centuries that passed, mandolins were developed to have frets and strings doubled to courses and a smaller lute called mandora emerged in the 4th century. Then, a petite gut-strung mandola called mandolino which had six strings grew in some areas in Italy. 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. It has strands of snares that are curled metal wires, plastic cables, gut chords, or metal cables extended across the bottom of the drum. It is cylindrical with skin stretched out at its top. A wooden drumstick is used to strike the top head which is also called batter-head. Many consider the snare drum to be one of the most significant drums included in the drum set. It lacked a register key so, on the 1800 s, it was modified and one of the keys became a register key. This gave rise to the clarinet. It was primarily known as the clarinetto. Some say that the inventor was Jacob Denner while some claim that it was his father, Johann Christoph Denner. What does a clarinet need? These instruments are also commonly used for different music genres such as salsa, rock, swing, and jazz. The trombone in the 20th century In the fist half of the 20th century, the trombone remained popular and widely used in the orchestra through works of various prominent artists like Leonard Bernstein, William Walton, and Richard Strauss.