The original sound of rock is centered on the amplified electric guitar, wich emerged in its modern form in the 1950's with the popularization of rock n'roll, and was influenced by the sounds of electric blues guitarists.
The sound of an electric guitar in rock music is ususally supported by an electric bass guitar, wish pioneered in jazz music in the same era, and percussion produced from a drum kit that combines drums and cymbals.
This trio of instruments has often been complemented by the inclusion of other instruments, particularly keyboards such as the piano, Hammond organ and synthesizers.
The basic rock instrumentation was adapted from the basic blues band instrumentation (prominent lead guitar, second chordal instrument, bass and dums).
A group of musicians performing rock music is termed a rock band or rock group, and usually consists of three to five members - the power trio used in rock, metal and punk rock.
Rock music is usually built on a foundation of simple unsyncopated rhythms in a 4/4 meter, with a repetitive snare drum back beat on beats two and four.
Melodies are often derived from older musical modes, including the Dorian and Mixolydian, as well as major and minor modes.
Harmonies range from the common triad to parallel fourths and fifths and dissonante harmonic progressions.
Rock songs, since the late 1950's and particulary from the mid-1960's onwards, often used the verse-chorus structure derived from blues and folk music, but there has been considerable variation from this model.
Critics have stressed the electicism and stylistic diversity of rock.
Because of its complex history and tendency to borrow from other musical and cultural forms, it has been argued that "it is impossible to bind rock music to a rigidly delineated musical defenition".
Unlike many earlier styles of popular music, rock lyrics have dealt with a wide range of themes in addition to rommantic love: including sex, rebellion against "The Establishment", social concerns and life styles.
These themes were inherited from a variety of sources, including the Tin Pan Alley pop tradicion, folk music and rhythms and blues.
Music journalist Robert Chrisrgau caracterizes rock lyrics as a "cool medium" wirh simple diction and repeated refrains, and asserts that rock's primary "function" pertains to music, or, more generally, noise.
The predominance of white, male and often middle class musicians in rock music has often been noted and rock has been seen as na appropriation of black musical forms for a young, white and largely male audience.
As a result, it has been as articulating the concerns of this group in both style and lyrics.
Ana
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