Yosakoi (よさこい) is a unique style of dance that originated in Japan. Yosakoi started in the city of Kōchi in 1954, as a modern rendition of Awa Odori, a traditional summer dance. Yosakoi-style dancing has spread throughout much of Japan. The style of dance is highly energetic, combining traditional Japanese dance movements with modern music. The choreographed dances are often performed by large teams. Along with a number of professional yosakoi schools and town dance teams, yosakoi is also a popular event during the sports festivals held by Japanese elementary, junior, and senior high schools. Yosakoi participants include men and women of almost all ages – sometimes within a single team. In the dialect of Tosa province (modern-day Kōchi Prefecture), "yosakoi" means "Come at night."
Costumes and naruko 
The costumes used by yosakoi teams vary widely. Happi coats and yukata are the most predominant costumes and can be seen in a wide variety of colors. However, some groups choose costumes that are based on historical attire, popular fashions, or ethnic fashions. Typically, all members of a team wear similar costumes.
One of the defining aspects of yosakoi dance is the use of naruko: small wooden clappers that are held in the hands of each dancer. Naruko were originally used in Kōchi Prefecture to scare birds away from rice fields. The traditional naruko has black and yellow beaters on a wooden body, but most modern yosakoi groups create their own naruko, choosing colors and materials that match their costumes. The use of naruko is required in yosakoi dance, but many groups also use other hand-held instruments or props, such as drums, other percussion instruments, flags, batons, and floats.
Yosakoi Naruko Dancing 
The official yosakoi dance is based on a song called "Yosakoi Naruko Dancing", written by Takemasa Eisaku. This song was created by combining elements of three songs: "Yosakoi-bushi" ("yosakoi melody"), "Yocchore" (a children's song), and "Jinma-mo" (a folk song of Kōchi Prefecture). The original competition in Kōchi requires that each team's music include some part of this original music. Competitions and festivals in other areas may not have this requirement (thus allowing teams to compose their own music), or may require that elements of different local folk songs are worked into the dance routines. Takemasa has given the copyright on "Yosakoi Naruko Dancing" to the public.
Yosakoi Matsuri 
Yosakoi Matsuri ("yosakoi festival") is a festival in the city of Kōchi, Japan. This is the original yosakoi festival: it has taken place every August since 1954. In this festival, teams of dancers and floats crowd to dance the yosakoi naruko dance together. The number of participants has been increasing yearly: as of 2005 over 10,000 dancers participate in this competition every year.
The rules of the Kōchi yosakoi competition are as follows:
- Participants must use the naruko clappers in the dance.
- Any musical arrangement is acceptable, but the music must contain at least some part of Takemasa's original "Yosakoi Naruko Dancing" song.
- Teams are limited to 150 participants.
Growing popularity of Yosakoi 
Since its introduction in 1954, yosakoi has become popular throughout the country of Japan. Now, Yosakoi-Soran festivals are held all over Japan, throughout the year. They vary in size from small villages hosting a few teams of dancers in conjunction with another annual festival, to large cities like Sendai, which hosts the Michinoku Yosakoi Festival, the third largest festival in Japan.
As of 2005, there were yosakoi festivals and competitions in over 200 locations.
- In Tokyo, the Harajuku Omotesando Genki Matsuri Super Yosakoi is a two-day yosakoi festival that takes place in five locations in Harajuku and Yoyogi Park. This festival has occurred annually since 2001.
- The Sakado, Saitama Yosakoi started in 2001 with 67 teams and 4600 paritcipants. The 11th festival was in 2011.
- Sapporo, Hokkaido held its inaugural Yosakoi Sōran Festival in 1992. The 16th festival began on June 6, 2007, in Odori Park and other venues.
- Sasebo, Nagasaki hosts the largest Yosakoi festival on Kyushu at the end of every October.
- Yosakoi has appeared on the television drama "Kinpachi Sensei" (3年B組金八先生).
- In Surabaya, which is a sister city of Kōchi, there is an annual Yosakoi competition. In 2007, the prize was presented by the mayor of Kōchi, Seiya Okazaki.
- In Sekolah Alam Shah, Putrajaya, during the Form 1 Cultural Night one of six sport houses will perform yosakoi.
- Internationally, Yosakoi is performed in Penang, Malaysia every year in July by local enthusiasts called the Pink Hibiscus Yosakoi Dancers, as well as in Accra, Ghana as an annual celebration to strengthen ties between Japan and Ghana. There are also yosakoi teams at universities outside of Japan, such as UC Berkeley, Kansas State University. and in New York City "Yosakoi Dance Project - 10tecomai"
- "Yosakoi-harajuku.com". Yosakoi-harajuku.com. Retrieved 2012-06-02.
- "第12回坂戸よさこい | 坂戸よさこいについて > 「坂戸よさこい」とは？". Sakadoyosakoi.com. Retrieved 2012-06-02.
- Berkeley Nikkei Student Union, click on Yosakoi
- "KSU Yosakoi". KSU Yosakoi. Retrieved 2012-06-02.
- Yosakoi Dance Project - 10tecomai - NYC Based Yosakoi Team
|Wikimedia Commons has media related to: Yosakoi|
- Dancing at Japanese Festivals Accessed October 11, 2005.
- The Kōchi Chamber of Commerce and Industry: Yosakoi festival (Japanese)
- Kōchi City: Yosakoi festival (Japanese)
- Sapporo City: Yosakoi Soran festival (Japanese)
- Yosakoi.tv (Japanese)