<P> Salsa music always has a 4 / 4 meter . The music is phrased in groups of two bars, using recurring rhythmic patterns, and the beginning of phrases in the song text and instruments . Typically, the rhythmic patterns played on the percussion are rather complicated, often with several different patterns played simultaneously . The clave rhythm is an important element that forms the basis of salsa . Apart from percussion, a variety of melodic instruments are commonly used as accompaniment, such as a guitar, trumpets, trombones, the piano, and many others, all depending on the performing artists . Bands are typically divided into horn and rhythm sections, led by one or more singers (soneros or salseros). </P> <P> Punk was a kind of rebellious rock music that began in the 1970s as a reaction against the popular music of the day - especially disco, which was seen as insipid and uninspired . Punk drew on American bands including the Velvet Underground, The Stooges and the New York Dolls . Punk was loud, aggressive and usually very simple, requiring little musical training to play . Later in the decade, British bands like the Sex Pistols and The Clash found short - lived fame at home and, to a lesser degree, in the United States . American bands in the field included most famously The Ramones, as well as groups like the Talking Heads that played a more artsy kind of music that was closely associated with punk before eventually evolving into pop - new wave . Other major acts include Blondie, Patti Smith and Television . Most of these bands got their start at what is considered "ground zero" of punk rock, a club named CBGB . The small club in New York threw a festival in 1975 that showed off the "top 40 unrecorded rock bands". Among these bands were the previously mentioned The Ramones, Sex Pistols, Blondie and the like . </P> <P> Hardcore punk was the response of American youths to the worldwide punk rock explosion of the late 1970s . Hardcore stripped punk rock and New Wave of its sometimes elitist and artsy tendencies, resulting in short, fast, and intense songs that spoke to disaffected youth . Hardcore exploded in the American metropolises of Los Angeles, Washington, DC, New York and Boston and most American cities had their own local scenes by the end of the 1980s . </P> <P> Alternative rock is a diverse grouping of rock bands that in America developed largely from the hardcore scene in the 1980s in stark opposition to the mainstream music scene . Alternative rock subgenres that developed during the decade include indie rock, Gothic rock, noise rock, grunge, and college rock . Most alternative bands were unified by their collective debt to punk, which laid the groundwork for underground and alternative music in the 1970s . Though the genre is considered to be rock, some styles were influenced by American folk, reggae and jazz . Like punk and hardcore, alternative rock had little mainstream success in America in the 1980s, but via the grassroots establishment of an indie scene through touring, college radio, fanzines, and word - of - mouth, alternative bands laid the groundwork for the breakthrough of the genre in the American public consciousness in the next decade . </P>

Which of the following instruments first came into common use in the 1960s and 1970s