With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Rock music is a type of music.
text_B: Rock music is a genre of popular music that originated as `` rock and roll '' in the United States in the early 1950s , and developed into a range of different styles in the 1960s and later , particularly in the United Kingdom and the United States .. United Kingdom. British rock. United States. American rock. popular music. popular music. rock and roll. rock and roll. It has its roots in 1940s and 1950s rock and roll , a style which drew heavily on the African-American genres of blues and rhythm and blues , and from country music .. blues. blues. country. country music. rhythm and blues. rhythm and blues. rock and roll. rock and roll. country music. country music. Rock music also drew strongly on a number of other genres such as electric blues and folk , and incorporated influences from jazz , classical and other musical styles .. blues. blues. electric blues. electric blues. folk. folk music. jazz. jazz. classical. classical music. Musically , rock has centered on the electric guitar , usually as part of a rock group with electric bass and drums and one or more singers .. drums. drum kit. electric guitar. electric guitar. rock group. rock group. electric bass. electric bass. Typically , rock is song-based music usually with a 4 / 4 time signature using a verse-chorus form , but the genre has become extremely diverse .. song. song. 4 / 4 time signature. Time signature. verse-chorus form. verse-chorus form. Like pop music , lyrics often stress romantic love but also address a wide variety of other themes that are frequently social or political .. pop. pop music. pop music. pop music. By the late 1960s `` classic rock '' period , a number of distinct rock music subgenres had emerged , including hybrids like blues rock , folk rock , country rock , raga rock , and jazz-rock , many of which contributed to the development of psychedelic rock , which was influenced by the countercultural psychedelic and hippie scene .. blues. blues. folk. folk music. country. country music. psychedelic rock. psychedelic rock. blues rock. blues rock. country rock. country rock. folk rock. folk rock. raga rock. raga rock. jazz. jazz. jazz-rock. Jazz fusion#Jazz-rock. countercultural. counterculture of the 1960s. psychedelic and hippie scene. psychedelia. hippie. hippie. New genres that emerged included progressive rock , which extended the artistic elements ; glam rock , which highlighted showmanship and visual style ; and the diverse and enduring subgenre of heavy metal , which emphasized volume , power , and speed .. glam rock. glam rock. heavy metal. heavy metal music. progressive rock. progressive rock. In the second half of the 1970s , punk rock reacted by producing stripped-down , energetic social and political critiques .. punk rock. punk rock. Punk was an influence in the 1980s on new wave , post-punk and eventually alternative rock .. new wave. New wave music. post-punk. post-punk revival. alternative rock. alternative rock. From the 1990s alternative rock began to dominate rock music and break into the mainstream in the form of grunge , Britpop , and indie rock .. indie rock. indie rock. alternative rock. alternative rock. grunge. grunge. Britpop. Britpop. Further fusion subgenres have since emerged , including pop punk , rap rock , and rap metal , as well as conscious attempts to revisit rock 's history , including the garage rock / post-punk and synth-pop revivals at the beginning of the 2000s -LRB- decade -RRB- .. synth-pop. synth-pop. garage rock. garage rock. post-punk. post-punk revival. rap rock. rap rock. pop. pop music. pop punk. pop punk. rap metal. rap metal. Rock music has also embodied and served as the vehicle for cultural and social movements , leading to major subcultures including mods and rockers in the UK and the hippie counterculture that spread out from San Francisco in the US in the 1960s .. mods. mod ( subculture ). rockers. rocker ( subculture ). hippie. hippie. Similarly , 1970s punk culture spawned the goth and emo subcultures .. punk culture. punk culture. goth. goth subculture. emo. emo. Inheriting the folk tradition of the protest song , rock music has been associated with political activism as well as changes in social attitudes to race , sex and drug use , and is often seen as an expression of youth revolt against adult consumerism and conformity .. folk. folk music. song. song. protest song. protest song. consumerism. consumerism. conformity. conformity
related.