Rock music is a genre of popular music that entered the mainstream in the 1950s. It has its roots in 1940s and 1950s rock and roll, rhythm and blues, country music and also drew on folk music, jazz and classical music. The sound of rock music often revolves around the electric guitar, a back beat laid down by a rhythm section of electric bass guitar, drums, and keyboard instruments such as Hammond 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, rock music has has three chords, a strong, insistent back beat, and a catchy melody.
The foundations of rock music are in rock and roll, which originated in the United States during the late 1940s and early 1950s, and quickly spread to much of the rest of the world. Rock Music's immediate origins lay in a mixing together of various black musical genres of the time, including rhythm and blues and gospel music; in addition to country and western. In 1951, Cleveland, Ohio disc jockey Alan Freed began playing rhythm and blues music for a multi-racial audience, and is credited with first using the phrase "rock and roll" to describe the music.
The Rock period of the later 1950s and early 1960s, between the end of the initial period of innovation and what became known in the USA as the "British Invasion", has traditionally been seen as an era of hiatus for rock and roll. More recently a number of authors have emphasised important innovations and trends in this period without which future developments would not have been possible. While early rock and roll, particularly through the advent of rockabilly, saw the greatest commercial success for male and white performers, in this era the genre was dominated by black and female artists. Rock and roll had not disappeared at the end of the 1950s and some of its energy can be seen in the Twist dance craze of the early 60s, mainly benefiting the career of Chubby Checker. Having died down in the late 1950s, doo wop enjoyed a revival in the same period, with hits for acts like The Marcels, The Capris, Maurice Williams and Shep and the Limelights. The rise of girl groups like The Chantels, The Shirelles and The Crystals placed an emphasis on harmonies and polished production that was in contrast to earlier rock and roll. Some of the most significant girl group hits were products of the Brill Building Sound, named after the block in New York where many songwriters were based, which included the #1 hit for the Shirelles "Will You Love Me Tomorrow" in 1960, penned by the partnership of Gerry Goffin and Carole King.
A Fabulous Inventory of Rock And Roll Music On Sale
 Johnny Winter The Essential Collection CD 16 Vintage Texas Blues Rock Songs NEW  US $2.66
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 Johnny Winter Livin in the Blues CD Texas Blues Rock Parchman Farm NEW US $2.44
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 2 with a Bullet 12 Hits of the 80s CD Rock Pop Air Supply Hall Oates NEW US $2.11
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 SHIPPING NEWS Save Everything CD slint rodan bitch magnet tortoise post rock US $1.56
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 Liquid Mind VII Reflection CD Ambient New Age Space Rock Relaxation US $3.25
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 1 CENT CD Finger Eleven Greyest Of Blue Skies rock US $3.30
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 1 CENT CD La Sera s t ex Vivian Girls indie rock 2011 US $4.55
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 ROCK ROLL 70s 2 CD SET 24 SONGS BY ORIGINAL ARTISTS BRAND NEW SEALED US $.99
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 Alan Jackson DONT ROCK THE JUKEBOX CD 1991 US $1.56
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 TEN JINN As on a Darkling Plain CD Progressive Rock NEW US $.99
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 ECLECTION S T CD UK PROG FOLK ROCK 1968 11 BONUS TRACKS US $15.79
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 MISHA Teardrop Sweetheart CD Brand new 2007 Indie Rock US $.99
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 MERZBOW AURAL TORTURE MECHANISM Split CD RARE Industrial Noise Rock US $4.99
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 BREETLES Writerscramp CD NEW Power Pop Brit Rock 2000 US $.99
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