The root (basse fondamentale) of a chord is the note upon which that chord is perceived or labelled as built or centered, the root of a chord in root position or normal form. This feeling of centeredness is readily perceivable aurally for the culturally trained, and is perhaps the pitch that would be most commonly sung if a chord was played and people were asked to sing a note in said chord, followed closely by the bass note or bottom note. When the chord is uninverted, or in root position, this is the bass note of the chord. Often the root is not actually the lowest pitch being played in a chord, in which case the chord is inverted.
Conventionally, the name of the note which is the root is used to denote the chord, thus a major chord built on C is a C Major chord. Since Rameau, the analysis and theory of tonal music usually treats the roots as the defining feature of chords and much information can be gained from a progression of roots even if chord types are unknown. Also, if the key is known then the chord forms are known for each root.
A root progression is the most familiar form of labelling chord progressions by their root, rather than bass if different, and is in contrast to an older pre-tonal conception of chords as sonorities, with a root position or first inversion triad being simply alternative and fairly equivalent ways of "filling in" the consonance between octaves, C (E G) C or C (F A) C.
In essence, the term "world music" refers to any form of music that is not part of modern mainstream Western commercial popular music or classical music traditions, and which typically originates from outside the cultural sphere of Western Europe and the English-speaking nations.
In musical terms, "world music" can be roughly defined as music which uses distinctive ethnic scales, modes and musical inflections, and which is usually (though not always) performed on or accompanied by distinctive traditional ethnic instruments, such as the kora (African lute), the steel drum, the sitar or the digeridoo.
World music as a cultural/economic phenomenon is inextricably linked with the invention of sound recording and the development of the international recording industry, but the background to its emergence covers the whole span of modern Western musical history, and what some analysts have deemed the digital revolution.
Rootsmusical forms reached their most expressive and varied forms in the first two to three decades of the 20th century.
The Great Depression and the Dust Bowl were extremely important in disseminating these musical styles to the rest of the country, as Delta blues masters, itinerant honky tonk singers and Latino and Cajun musicians spread to cities like Chicago, Los Angeles and New York.
American rootsmusic was the subject of a documentary series on PBS in 2001.
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