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Rock is a topic not often touched on because of its complexity and its evasion by conservative adults. Often viewed by them as “a bunch of noise”, Rock music is very complex. In fact “It's stylistic scope is too broad to be encompassed by any single definition” (Groliers Encyclopaedia). The nearest definition suggests a kind of music that represents and speaks for the teenage society. This music is characterised by using a heavy beat. In this musicology, I intend to describe the technical aspects that make Rock Music what it is. I'm also going to divide Rock music into four sections: Rock of the 50's, of the 60's, of the 70's and of the 80's. Within these sections I'm going to discuss several sub-topics such as famous composers and groups, and characteristics of the music. Rock music shares many technical aspects. Most rock music is based on the same harmonies as Western music, especially the tonic, subdominant, and dominant chords. The series of chords known as the 12-bar blues is based on these three chords and has figured prominently in certain styles, especially Rock & Roll, Soul Music, and Southern Rock. Other common harmonic devices include the use of a drone, and the parallel movement of chords, originating fro