Rock music is a wide range of pop music genres, originated in the 1950s in the United States "rock", and in the 1960s and later developed into a variety of styles, especially in the United States and Britain. It originated in rock and roll in the 1940s and 1950s, a style largely derived from blues, rhythm and blues schools, as well as country music. Rock music is also influenced by other types of music, such as electric blues and folk music, and incorporates jazz, classical music and other musical styles. Musically, rock music has always been centered around the electric guitar, usually part of a rock band, including the electric bass, drum and one or more singers. Generally, rock music is based on songs, usually using chorus form with 4 / 4 time sign, but the genres have become extremely diverse. Like pop music, lyrics usually emphasize romantic love, but they also cover other topics often related to society or politics.

In the period of "classical rock" in the late 1960s, there were many unique sub schools of rock music, including blues rock, folk rock, country rock, Southern rock, laga rock and jazz rock. Many of them promoted the development of Psychedelic Rock, which was influenced by anti culture psychedelic and hippie scenes. Emerging new types include progressive rock, which extends the artistic element. Gorgeous rock, showing the performance and visual style; heavy metal variety, enduring, focusing on volume, power and speed. In the second half of the 1970s, punk rock responded with a streamlined, vibrant social and political commentary. Punk music influenced the new wave, post punk music and finally alternative rock in the 1980s. From the 1990s, alternative rock began to dominate rock music, and entered the mainstream in the form of rock, British pop music and independent rock. Since then, there have been more fusion sub genres, including pop punk, electronic rock, rap rock and rap metal, as well as conscious attempts to revisit the history of rock music, including garage rock / post punk and techno pop Renaissance in the early 2000s.

Rock music also embodies and acts as a carrier of culture and social movements, leading to major subcultures, including mod and rock musicians in Britain, and hippie anti culture spread from San Francisco in the 1960s. Similarly, the punk culture of the 1970s gave birth to Gothic, punk and emo subcultures. Rock music inherits the folk tradition of protest songs, is associated with political activism and changes in social attitudes towards race, gender and drug use, and is often seen as an expression of young people's resistance to adult consumerism and compliance.

The sound of rock is traditionally centered on the amplified electric guitar. With the popularity of rock music, this kind of electric guitar appeared in modern form in the 1950s. In addition, it is influenced by the voice of the Electric Blues Guitarist. In rock music, the sound of the electric guitar is usually supported by the electric bass guitar, which is the founder of jazz music in the same era, and the percussion music is produced by the combination of drum and drum. These triple instruments are usually supplemented by the inclusion of other instruments, especially keyboards, such as the piano, Hammond and synthesizer. Basic rock and roll instruments are derived from basic blues band instruments (famous tonic guitar, second chord instrument, bass and drum). A group of musicians performing rock music is called a rock band or a rock band. In addition, it usually consists of three members (a three member group) and five members. Generally, a rock band takes the form of a Quartet in which members play one or more roles, including singer, lead guitarist, rhythm guitarist, bass guitarist, drummer, and often keyboard player or other instrument player.

Traditionally, rock music is based on a simple 4 / 4 meter rhythmic rhythm, with repetitive drum beats in the second and fourth beats. Melodies usually originate from older musical patterns, such as Dorian and Mixolydian, as well as major and minor patterns. Homophony ranges from ordinary triads to parallel perfect Quartets and quintiles, as well as disharmonious harmonics. Since the late 1950s, especially from the mid-1960s, rock music often uses reverse chorus structure from blues and folk music, but this model has changed a lot. Critics stress the eclecticism and style diversity of rocks. Because of its complex history and tendency to learn from other music and cultural forms, some people believe that "it is impossible to combine rock music with a strictly defined definition of music".

Rock'n'Roll is regarded as the way out for teenagers. Making rock music is also an ideal way to explore, love, violence and fun, spread the joy and limitations of the region and make deals. The corruption and benefits of mass culture itself.

Unlike many early pop styles, rock lyrics deal with a wide range of themes, including romantic love, sex, rebellion against "institutions," social attention and lifestyle. These themes are inherited from popular traditions such as Tin Pan Alley, folk music, and various sources such as rhythm and blues. Robert Christgau, a music journalist, characterized rock lyrics as "cool media" with simple usage and repeated inhibition, and asserted that the main "function" of rock music "belongs to music or, more generally, noise". White, male and often middle-class musicians dominate rock music, and rock has always been considered a form of black music for young, white and mostly male audiences. As a result, people also see their focus on style and lyrics. Christgau, who wrote in 1972, said that despite some exceptions, "rock and roll usually means identification with male sexuality and aggression.".

Since the use of the word "rock" began in the late 1960s, the use of the word "rock" has been relatively common, which has formed a sharp contrast with pop music. Although pop music has many common features, it is often distinguished from the focus. Regarding musical talent, live performance, and the emphasis on serious and enterprising themes as part of the ideology of authenticity, they are usually combined with an understanding of this type of history and development. According to Simon Frith, rock music "is more important than pop music, more important than rock music", "rock musicians will combine the emphasis on skills and techniques with romantic artistic concepts, that is, artistic expression, originality and sincerity."

In the new millennium, the term "rock" is occasionally used as a general term, including pop music, reggae music, soul music and even hip-hop music. It has been influenced in many history, but often in sharp contrast. Christgau uses the term extensively to refer to pop and semi pop music to cater to his sensitivity as a "rock musician," including his love of rhythm, intelligent Lyric lyrics and youth themes. It has an "eternal attraction" with such an objective goal that all youth Music participates in sociology and field reporting. This sensitivity is evident in the music of folk singer songwriter Michelle shocked, rapper LL Cool J and synthesizer pop duo pet shop boys, he wrote in Christchurch's album Guide: the 1980s (1990). Identity "is like the music of Chuck Berry, Ramones and substitutes.