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Rock
,→Blues Influence
== Blues Influence ==
Rock is strongly influenced by [[Blues|blues]]. If you notice, the minor pentatonic scale is the same as the blues scale but missing the tritone. Rock is historically an outgrowth of African-American blues merged with swing, country, folk and other genres.
This blues influence has never been completely separated from rock - even modern heavy metal often incorporates some aspects of blues playing. Melodic conventions, blue notes, I - IV - V - I modulations, slow-moving or static harmonies, are all derived from blues backgrounds.
The main technical difference between blues and rock the two is that rock is more energetic and dance-oriented than blues. Following this, rock is more up-tempo and incorporates a back-beat with the snare. Vocal timbres are often more lively or outright screams. While blues has been fairly traditional in its approach, rock has been more experimental, leading to a wide variety of harmonic progressions, song structures, timbres, and melodies. Thus, rock has a much larger number of sub-genres.
== Four Chord Songs: I - V - vi - IV ==