much of contemporary popular music. Rock and pop harmony Harmonically, in rock music, the most common way to construct chord progressions is to play major and minor "triads", each comprising a root, third and fifth note of a given scale. An example of a major triad is C major, which contains the notes C, E and G. An example of a minor triad is the A minor chord, which includes the notes A, C and E. Interspersed are some four-note chords, which include the root, third and fifth, as well as a sixth, seventh or ninth note of the scale. The most common chord with four different notes is the dominant seventh chord, which include a root, a major third above the root, a perfect fifth above the root and a flattened seventh. In the key of C major, the dominant seventh chord is a G7, which consists of the notes G, B, D and F. Three-chord progressions are common in earlier pop and rock, using various combinations of the I, IV and V chords, with the twelve-bar blues particularly common. A four chord progression popular in the 1950s is I-vi-ii-V, which in the key of C major is the chords C major, a minor, d minor and G7. Minor and modal chord progressions such as I-bVII-bVI (in the key of E, the chords E major, D major, C major) feature in popular music. In heavy metal music, rhythm guitarists often play power chords, which feature a root note and a fifth above, or with an octave doubling the root. There actually is no third of the chord. Power chords are usually played with distortion. Arpeggios One departure from the basic strummed chord technique is to play arpeggios, i.e. to play individual notes in a chord separately. If this is rapidly done enough, listeners will still hear the sequence as harmony rather than melody. Arpeggiation is often used in folk, country, and heavy metal, sometimes in imitation of older banjo technique. It is also prominent in 1960s pop, such as The Animals' "House of the Rising Sun", and jangle pop from the 1980s onwards. Rhythm guitarists who use arpeggio often favor semi-acoustic guitars and twelve string guitars to get bright, undistorted "jangly" sound. The Soukous band TPOK Jazz additionally featured the unique role of mi-solo, (meaning "half solo") guitarist, playing arpeggio patterns and filling a role "between" the lead and