Answer the question at the end by quoting:

The Manchu (Manchu: manjU; Mollendorff: manju; Abkai: manju; simplified Chinese: Man Zu ; traditional Chinese: Man Zu ; pinyin: Manzu; Wade-Giles: Man3-tsu2) are an ethnic minority in China and the people from whom Manchuria derives its name. They are sometimes called "red-tasseled Manchus", a reference to the ornamentation on traditional Manchu hats. The Later Jin (1616-1636), and Qing dynasty (1636-1912) were established by Manchus, who are descended from the Jurchen people who earlier established the Jin dynasty (1115-1234) in China. Manchus form the largest branch of the Tungusic peoples and are distributed throughout China, forming the fourth largest ethnic group in the country.
Octagonal drum is a type of Manchu folk art that was very popular among bannermen, especially in Beijing. It is said that octagonal drum originated with the snare drum of the Eight-banner military and the melody was made by the banner soldiers who were on the way back home from victory in the battle of Jinchuan. The drum is composed of wood surrounded by bells. The drumhead is made by wyrmhide with tassels at the bottom. The colors of the tassels are yellow, white, red, and blue, which represent the four colors of the Eight Banners. When artists perform, they use their fingers to hit the drumhead and shake the drum to ring the bells. Traditionally, octagonal drum is performed by three people. One is the harpist; one is the clown who is responsible for harlequinade; and the third is the singer.  "Zidishu" is the main libretto of octagonal drum and can be traced back to a type of traditional folk music called the "Manchu Rhythm". Although Zidishu was not created by Han Chinese, it still contains many themes from Chinese stories, such as Romance of the Three Kingdoms, Dream of the Red Chamber, Romance of the West Chamber, Legend of the White Snake and Strange Stories from a Chinese Studio. Additionally, there are many works that depict the lives of Bannermen. Aisin Gioro Yigeng, who was pen named "Helu" and wrote the sigh of old imperial bodyguard, as the representative author. Zidishu involves two acts of singing, which are called dongcheng and xicheng.  After the fall of the Qing dynasty, the influence of the octagonal drum gradually reduced. However, the Chinese monochord and crosstalk which derived from octagonal are still popular in Chinese society and the new generations. Many famous Chinese monochord performers and crosstalkers were the artists of octagonal drum, such as De Shoushan and Zhang Sanlu.

Why was the Octagon shape chosen for the drum?



IN: Usain St Leo Bolt  (; born 21 August 1986) is a retired Jamaican sprinter and world record holder in the 100 metres, 200 metres and 4 x 100 metres relay. His reign as Olympic Games champion in all of these events spans multiple Olympics. Due to his achievements and dominance in sprint competition, he is widely considered to be the greatest sprinter of all time.

The silver medals from the 2007 Osaka World Championships boosted Bolt's desire to sprint, and he took a more serious, more mature stance towards his career. Bolt continued to develop in the 100 m, and he decided to compete in the event at the Jamaica Invitational in Kingston. On 3 May 2008, Bolt ran a time of 9.76 s, with a 1.8 m/s tail wind, improving his personal best from 10.03 s. This was the second-fastest legal performance in the history of the event, second only to compatriot Asafa Powell's 9.74 s record set the previous year in Rieti, Italy. Rival Tyson Gay lauded the performance, especially praising Bolt's form and technique. Michael Johnson observed the race and said that he was shocked at how quickly Bolt had improved over the 100 m distance. The Jamaican surprised even himself with the time, but coach Glen Mills remained confident that there was more to come.  On 31 May 2008, Bolt set a new 100m world record at the Reebok Grand Prix in the Icahn Stadium in New York City. He ran 9.72s with a tail wind of 1.7 m/s. This race was Bolt's fifth senior 100 m. Gay again finished second and said of Bolt: "It looked like his knees were going past my face." Commentators noted that Bolt appeared to have gained a psychological advantage over fellow Olympic contender Gay.  In June 2008, Bolt responded to claims that he was a lazy athlete, saying that the comments were unjustified, and he trained hard to achieve his potential. However, he surmised that such comments stemmed from his lack of enthusiasm for the 400 metres event; he chose not to make an effort to train for that particular distance. Turning his efforts to the 200 m, Bolt proved that he could excel in two events--first setting the world-leading time in Ostrava, then breaking the national record for the second time with a 19.67 s finish in Athens, Greece. Although Mills still preferred that Bolt focus on the longer distances, the acceptance of Bolt's demand to run in the 100 m worked for both sprinter and trainer. Bolt was more focused in practice, and a training schedule to boost his top speed and his stamina, in preparation for the Olympics, had improved both his 100 m and 200 m times.

Did he have a coach to help him train?

OUT:
coach Glen Mills