Weekly Review: Mardi Gras all over the world

It has also made use of technological innovation. Rock music is traditionally built on a foundation of simple unsyncopated rhythms in a 4/4 meter, with a repetitive snare drum back beat on beats two and four.[10] Melodies are often derived from older musical modes, including the Dorian and Mixolydian, as well as major and minor modes. Pop is not a do-it-yourself music but is professionally produced and packaged". since the late 1950s, however, pop has had the special meaning of non-classical mus[ic], usually in the form of songs, performed by such artists as the Beatles, the Rolling Stones, ABBA, etc".[11] Grove Music Online also states that "… New genres that emerged from this scene 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.

Rock places a higher degree of emphasis on musicianship, live performance, and an ideology of authenticity than pop music. By the late 1960s, referred to as the "golden age"[3] or "classic rock"[1] period, a number of distinct rock music subgenres had emerged, including hybrids like blues rock, folk rock, country rock, raga rock, and jazz-rock fusion, many of which contributed to the development of psychedelic rock, which was influenced by the countercultural psychedelic scene. Pop is not a do-it-yourself music but is professionally produced and packaged".

Classically, a rock band takes the form of a quartet whose members cover one or more roles, including vocalist, lead guitarist, rhythm guitarist, bass guitarist, drummer and often that of keyboard player or other instrumentalist. In the 1940s improved microphone design allowed a more intimate singing style[19] and ten or twenty years later inexpensive and more durable 45 r.p.m. Pop is not a do-it-yourself music but is professionally produced and packaged". since the late 1950s, however, pop has had the special meaning of non-classical mus[ic], usually in the form of songs, performed by such artists as the Beatles, the Rolling Stones, ABBA, etc".[11] Grove Music Online also states that "… New genres that emerged from this scene 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. Pop is not a do-it-yourself music but is professionally produced and packaged". By the late 1960s, referred to as the "golden age"[3] or "classic rock"[1] period, a number of distinct rock music subgenres had emerged, including hybrids like blues rock, folk rock, country rock, raga rock, and jazz-rock fusion, many of which contributed to the development of psychedelic rock, which was influenced by the countercultural psychedelic scene. 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 sources. Such elements include generally short to medium-length songs, written in a basic format (often the verse-chorus structure), as well as the common employment of repeated choruses, melodic tunes, and hooks.