Rock and roll

Rock and roll (often written as rock & roll or rock 'n' roll) is a genre of popular music that originated and evolved in the United States during the late 1940s and early 1950s, primarily from a combination of African American blues, jump blues, country, jazz, and gospel music. 蓝 调， 跳跃蓝调， 国家， 爵士， 和 福音音 乐 Though elements of rock and roll can be heard in country records of the 1930s,and in blues records from the 1920s,rock and roll did not acquire its name until the 1950s
American Music
POP JAZZ COUNTRY HIP-HOP RAP ROCK BLUES ETC..
Jazz

Jazz is a musical style that originated at the beginning of the 20th century in black communities in the Southern United States. It was born out of a mix of African and European music traditions. Its African pedigree is evident in its use of blue notes, improvisation, polyrhythms, syncopation and the swung note. 蓝色笔记， 即兴， 复节奏， 中 略 和 摇摆音符。From its early development until the present day, jazz has also incorporated elements from American popular music.
Hip hop

Hip Hop is a subculture that originated from an African American community during the 1970s in New York City, specifically in Morris Heights, Bronx, then later has influence to Latin American communities. While the term is often used to refer to hip hop music, in its broader sense hip hop culture is characterized by the four elements of rapping, DJing, breaking and graffiti 说唱， 打碟， 打破 和 涂鸦
Country muቤተ መጻሕፍቲ ባይዱic

Country music is a genre of American popular music that began in the rural regions of the Southern United States in the 1920s and 20th century Canada. It takes its roots from southeastern American folk music, Western cowboy. Blues mode has been used extensively throughout its recorded history. Country music often consists of ballads and dance tunes with generally simple forms and harmonies accompanied by mostly string instruments such as banjoes, electric and acoustic guitars, fiddles, and harmonicas. 弦乐器， 电 和 声学 吉他，小提琴和 ， 口琴
Blues

Blues is the name given to both a musical form and a music genre that originated in African-American communities of primarily the "Deep South" of the United States around the end of the 19th century from spirituals, work songs, field hollers, shouts and chants, 灵 歌， 劳动歌曲， 田野呐喊，喊声 和 圣歌， and rhymed simple narrative ballads. The blues form, ubiquitous in jazz, rhythm and blues, and rock and roll is characterized by specific chord progressions, of which the twelve-bar blues chord progression is the most common.