Leonard Cohen

Pop music is a genre of popular music which originated in the 1950s, deriving from rock and roll. The terms popular music and pop music are often... used interchangeably, even though the former is a description of any form of music which is popular , whilst the latter is a specific genre of music which has qualities which would make it appealing to a large audience. Pop music, as a genre, is very eclectic, often borrowing elements from other styles throughout its course such as urban, dance, rock, Latin and country, yet there are core elements which define it. Such include generally short-to-medium length songs, written in a basic format which is often the verse-chorus structure, which generally make usage of repeated choruses, have a melodic sound, and have catchy hooks. So-called "pure pop" music, such as power pop, features all these elements, and for instrumentation uses electric guitars, drums and a bass; in the case of such music, the main goal is usually that of being pleasurable to listen to, rather than having much artistic depth.
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Rock music is a genre of popular music that developed during and after the 1960s, particularly in the United Kingdom and the United States. It has... its roots in 1940s and 1950s rock and roll, itself heavily influenced by rhythm and blues and country music. Rock music also drew strongly on a number of other genres such as blues and folk, and incorporated influences from jazz, classical and other musical sources. Musically, rock has centred around the electric guitar, usually as part of a rock group with bass guitar and drums. Typically, rock is song-based music with a 4/4 beat utilizing a verse-chorus form, but the genre has become extremely diverse and common musical characteristics are difficult to define. Like pop music, lyrics often stress romantic love but also address a wide variety of other themes that are frequently social or political in emphasis. The dominance of rock by white, male musicians has been seen as one of the key factors shaping the themes explored in rock music. Rock places a higher degree of emphasis on musicianship, live performance, and an ideology of authenticity than pop music.
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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 at the end of the 19th century from spirituals, work songs, field hollers, shouts and chants, 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. The blue notes that, for expressive purposes are sung or played flattened or gradually bent in relation to the pitch of the major scale, are also an important part of the sound. The blues genre is based on the blues form but possesses other characteristics such as specific lyrics, bass lines and instruments. Blues can be subdivided into several subgenres ranging from country to urban blues that were more or less popular during different periods of the 20th century. Best known are the Delta, Piedmont, Jump and Chicago blues styles.
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