quality:correction
1940s–1960s: Arrival of Western culture

After the Korean Peninsula was partitioned into North and South following its liberation in 1945 from Japanese occupation, Western culture was introduced into South Korea on a small scale, with a few Western-styled bars and clubs playing Western music. After the Korean War (1950–1953) U.S. troops remained in South Korea, causing American and world culture to spread in South Korea and Western music to gradually become more accepted. Prominent figures of American entertainment like Nat King Cole, Marilyn Monroe and Louis Armstrong held USO shows in South Korea for the U.S. Army. These visits prompted attention from the Korean public. In 1957, the American Forces Korea Network radio started its broadcast, spreading the popularity of Western music. American music started influencing Korean music, as pentatony was gradually replaced by heptachords and popular songs started to be modeled after American ones.

In the 1960s, the development of LP records and improvements in recording technology led to the pursuit of diverse voice tones. Open auditions were also held to recruit musicians to perform at the U.S. army clubs. Since South Korea was impoverished after the Korean War, skilled Korean singers regarded performing for the U.S. troops as a good means to earn money. Many singers sang for the American troops, usually in dedicated clubs, the number of which rose to 264. They performed various genres like country music, blues, jazz and rock & roll. The South Korean economy started blooming and popular music followed the trend, spread by the first commercial radio stations. Korean cinema also began to develop and Korean musicians began performing to wider audiences.

When Beatlemania reached the shores of Korea the first local rock bands appeared, the first of which is said to be Add4, a band founded in 1962. The first talent contest for rock bands in Seoul was organized in 1968.

Some Korean singers gained international popularity. In 1959, the Kim Sisters went to Las Vegas and became the first Korean artist to release an album in the U.S. pop market. Their cover of "Charlie Brown" reached No.7 on the Billboard Single Chart. The Kim Sisters also appeared on TV programs and radio programs and held tours in the U.S. and Europe. They made 25 appearances on The Ed Sullivan Show —more than American stars like Patti Page and Louis Armstrong (who appeared 18 times each). The Kim Sisters, Yoon Bok-hee and Patti Kim were the first singers to debut in such countries as Vietnam and the United States. The Kim Sisters became the first Korean group to release an album in the United States. They also performed in Las Vegas. Han Myeong-suk 's 1961 song "The Boy in The Yellow Shirt" was covered by French singer Yvette Giraud and was also popular in Japan.

In the 1960s, the Korean artists such as Shin Joong-hyun, Pearl Sisters and Patti Kim who previously performed for the U.S. army clubs reached out to the Korean public. In the mid-1960s, due to the influence of the legendary British group The Beatles, there was a rise of "group sound" in South Korea, for example, Add4 and the Key Boys. Add4, Korea's first rock group, was formed by Shin Joong-hyun in 1962 and produced Korea's first rock song, "The Woman in the Rain," which is a form of light rock reminiscent of the early Beatles. Shin Joong-hyun was so instrumental in the development of Korean rock music that he is regarded as the "godfather of Korean rock" in South Korea.

During this period, with the rise of Western pop music and Korean rock music, trot was no longer predominant in South Korea. However, trot singers like Lee Mi-ja still managed to attract a certain level of popularity, with famous songs like "Camellia Lady" (동백 아가씨; 冬柏 아가씨; dongbaek agassi).

During the 1950s and 60s, Western pop music, Korean rock music, and trot co-existed in South Korea.