The first type of rock music, rock and roll, originated in the United States in the 1950s, and was largely derived from music of the American South. In the United States, the affluence that followed the end of World War II in 1945 and the emergence of a youth culture—based in part upon the rejection of older styles of popular culture—helped rock and roll to displace the New York City-based Tin Pan Alley songwriting tradition that had dominated the mainstream of American popular taste since the late 19th century. Rock and roll was a combination of the R&B style known as jump blues, the gospel-influenced vocal-group style known as doo wop, the piano-blues style known as boogie-woogie (or barrelhouse), and the country-music style known as honky tonk
George Columbow on 31 May 121 / the silent architecture of our music the organic source of our 12 pitches, how we tune our instruments 2 / loops of pitches the perfect closure of equal temper tuning 3 / groups of pitches the initial process of selecting pitches to create melody 4 / major / minor tonality the two core colors of equal temper 5 / evolution of scales organically evolving and organizing of our melodic resources 6 / evolving scales into arpeggios the theory how scales become arpeggios 7 / evolving arpeggios into chords the theory of how arpeggios become chords 8 / rhythm cool ideas about musical time, its subdivision and notation 9 / highlights of the history of music seven highlights to begin one's study of music history 10 / composing practical ideas for putting one's ideas into music 11 / how to practice ... something you don't know how to play
