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'''Rock and roll''' (or just '''rock''') quickly became the dominant style of music in the late 20th century. This page lists many of its aspects.

'''Power chords''' aren't actually chords - they consist only of root and 5th; they are intervals. Typically, power chords are voiced root - 5th or root - 5th - octave. Sometimes they are voiced as simple 5th - root inversions (P4 intervals), which can make it easier to play several in quick succession. Rarely, you will see them as the 4-string root - 5th - octave - 5th.

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