Rock music is a loosely defined genre of popular music that entered the mainstream in the mid 1950's. It has its roots in 1940s and 1950s rhythm and blues, country music and other influences. In addition, rock music drew on a number of other musical influences, including folk music, jazz, and classical music.
The sound of rock often revolves around the electric guitar or acoustic guitar, and it uses a strong back beat laid down by a rhythm section of electric bass guitar, drums, and keyboard instruments such as organ, piano, or, since the 1970s, synthesizers. Along with the guitar or keyboards, saxophone and blues-style harmonica are sometimes used as soloing instruments. In its "purest form", it "has three chords, a strong, insistent back beat, and a catchy melody."[1]
In the late 1960s and early 1970s, rock music developed different subgenres. When it was blended with folk music it created folk rock, with blues to create blues-rock and with jazz, to create jazz-rock fusion. In the 1970s, rock incorporated influences from soul, funk, and latin music. Also in the 1970s, rock developed a number of subgenres, such as soft rock, glam rock, heavy metal, hard rock, progressive rock, and punk rock. Rock subgenres that emerged in the 1980s included New Wave, hardcore punk and alternative rock. In the 1990s, rock subgenres included grunge, Britpop, indie rock, and nu metal.
I like rock music ,so I prefer to present some infomation of rock music.

vanity

All the human seek for the besuty of the appearance ,even if the purpose is different.Generely speaking ,the appearance influce very much for the first impresion.So we can understand that women and men all are interested in their appearance,of course every one has its own personlity,so the vanity is depended on every one.
Because of the diference between wen and women ,women talk to their friends how they look ,wen don't talk so much.The fact is that women like more shopping than men,men like go shopping alone,they don't have patience,and don't like comprae so much.
In the modern society,men ues more cometics than 10 years ago ,also women have more cometics too.This is a reslut of the develpment of the economia .In my opipion ,the vanity dependes on every one.