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K-pop, short for Korean popular music, is a form of popular music originating in South Korea as part of South Korean culture. It includes styles and genres from around the world, such as pop, hip hop, R&B, experimental, rock, jazz, gospel, reggae, electronic dance, folk, country, disco, and classical on top of its traditional Korean music roots. The term "K-pop" became popular in the 2000s. Previously, South Korean pop music was called gayo. While "K-pop" can be a general term for all popular music from South Korea or pop music from the country, it is colloquially often used in a narrower sense for any Korean music and artists associated with the entertainment and idol industry in the country, regardless of the genre.

The more modern form of the genre emerged with the formation of the hip hop boy band Seo Taiji and Boys, in 1992. Their experimentation with different styles and genres of music and integration of foreign musical elements helped reshape and modernize South Korea's contemporary music scene.

Modern K-pop "idol" culture began in the 1990s, as K-pop idol music grew into a subculture that amassed enormous fandoms of teenagers and young adults. After a slump in early idol music, from 2003, TVXQ and BoA started a new generation of K-pop idols that broke the music genre into the neighboring Japanese market and continue to popularize K-pop internationally today. With the advent of online social networking services and South Korean TV shows, the current spread of K-pop and South Korean entertainment, known as the Korean Wave, is seen not only in East Asia and Southeast Asia, but also in Pakistan, Bangladesh, India, Latin America, North Africa, Southern Africa and East Africa, the Middle East and throughout the Western world, gaining an international audience.

In 2018, K-pop experienced significant growth and became a "power player", marking a 17.9% increase in revenue growth. As of 2019, Korean popular music is ranked at number six among the top ten music markets worldwide according to the International Federation of the Phonographic Industry's "Global Music Report 2019", with BTS and Blackpink cited as artists leading the market growth. In 2020, K-pop experienced a record-breaking year when it experienced a 44.8% growth and positioned itself as the fastest-growing major market of the year.

Etymology
The first known use of the term K-pop occurred on Billboard in the October 9, 1999 edition at the end of an article titled "S. Korea To Allow Some Japanese Live Acts" by Cho Hyun-jin, then a Korea correspondent for the magazine, which used it as a broad term for South Korean pop music. Cho himself, however, is not sure if he coined the term, since some articles stated that the word 'K-pop' was already being used by the music industry insiders, even though he had never heard it personally.

Audiovisual content
Although K-pop generally refers to South Korean popular music and the associated industry, some consider it to be an all-encompassing genre exhibiting a wide spectrum of musical and visual elements. The French Institut national de l'audiovisuel defines K-pop as a "fusion of synthesized music, sharp dance routines and fashionable, colorful outfits." Songs typically consist of one or a mixture of pop, rock, hip hop, R&B, and electronic music genres.

Systematic training of artists
South Korean management agencies offer binding contracts to potential artists, sometimes at a young age. Trainees live together in a regulated environment and spend many hours a day learning how to sing, dance, speak foreign languages, and gain other skills in preparation for their debut. This "robotic" system of training is often criticized by Western media outlets. In 2012, The Wall Street Journal reported that the cost of training one Korean idol under SM Entertainment averaged US$3 million.

Hybrid genre and transnational values
K-pop is a cultural product that features "values, identity and meanings that go beyond their strictly commercial value." It is characterized by a mixture of modern Western sounds and African-American influences (including sounds from Hip-hop, R&B, Jazz, black pop, soul, funk, techno, disco, house, and Afrobeats) with a Korean aspect of performance (including synchronized dance moves, formation changes and the so-called "point choreography" consisting of hooking and repetitive key movements). It has been remarked that there is a "vision of modernization" inherent in Korean pop culture. For some, the transnational values of K-pop are responsible for its success. A commentator at the University of California, San Diego has said that "contemporary Korean pop culture is built on ... transnational flows ... taking place across, beyond, and outside national and institutional boundaries." Some examples of the transnational values inherent in K-pop that may appeal to those from different ethnic, national, and religious backgrounds include a dedication to high-quality output and presentation of idols, as well as their work ethic and polite social demeanor, made possible by the training period.

Use of English phrases
Modern K-pop is marked by its use of English phrases. Jin Dal Yong of Popular Music and Society  wrote that the usage may be influenced by "Korean-Americans and/or Koreans who studied in the U.S. [who] take full advantage of their English fluency and cultural resources that are not found commonly among those who were raised and educated in Korea." Korean pop music from singers or groups who are Korean-American such as Fly to the Sky, g.o.d, Rich, Yoo Seung-jun, and Drunken Tiger has both American style and English lyrics. These Korean-American singers' music has a different style from common Korean music, which attracts the interest of young people. Increasingly, foreign songwriters and producers are employed to work on songs for K-pop idols, such as will.i.am and Sean Garrett. Foreign musicians, including rappers such as Akon, Kanye West, Ludacris, and Snoop Dogg, have also featured on K-pop songs.

Entertainment companies help to expand K-pop to other parts of the world through a number of different methods. Singers need to use English since the companies want to occupy markets in the other parts of Asia, which enables them to open the Western market in the end. Most K-pop singers learn English because it is a common language in the world of music, but some singers also learn other foreign languages such as Japanese to approach the Japanese market. Similarly, increasing numbers of K-pop bands use English names rather than Korean ones. This allows songs and artists to be marketed to a wider audience around the world.