Chord progression
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In a musical composition, a chord progression or harmonic progression is a succession of chords. Chord progressions are the foundation of harmony in Western musical tradition from the common practice
Blues progressions influenced a great deal of 20th century American popular music
Rock and roll
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Rock and roll is a genre of popular music that evolved in the United States during the late 1940s and early 1950s. The origins of rock and roll are rooted in a blending of African-American musical gen
Sign commemorating the role of Alan Freed and Cleveland, Ohio, in the origins of rock and roll
Disc jockey Alan Freed is credited with popularizing the term "rock and roll" and introducing the genre across racial barriers in the 1950s
Chuck Berry in 1958
Big Joe Turner and Pete Johnson's record "Roll 'Em Pete" is regarded as a precursor to rock and roll.