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What was the blues originally called?

In the 19th century the English phrase blue devils referred to the upsetting hallucinations brought on by severe alcohol withdrawal. This was later shortened to the blues, which described states of depression and upset, and it was later adopted as the name for the melancholic songs that the musical genre encapsulates.

britannica.com - blues | Definition, Artists, History, Characteristics, Types, Songs, & Facts

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The blues has a distinct melancholic and somber tone, which is achieved through vocal techniques such as melisma , rhythmic techniques such as syncopation , and instrumental techniques such as “choking” guitar strings on the neck or applying a metal slide to the guitar strings to create a whining voicelike sound. In the early 20th century the blues (among several other popular genres of music) was considered seductive and destructive by parents and clergy who worried that such “Devil’s music” was a dangerous and sinful influence on children. The origins of the blues are poorly documented, but it is believed that after the American Civil War (1861–65), formerly enslaved African Americans and their descendants created this genre while working on Southern plantations, taking inspiration from hymns , minstrel show music, work songs and field hollers, ragtime , and popular music of the Southern white population. In the 19th century the English phrase blue devils referred to the upsetting hallucinations brought on by severe alcohol withdrawal. This was later shortened to the blues, which described states of depression and upset, and it was later adopted as the name for the melancholic songs that the musical genre encapsulates. The blues is a form of secular folk music created by African Americans in the early 20th century, originally in the South. Although instrumental accompaniment is almost universal in the blues, the blues is essentially a vocal form. Blues songs are usually lyrical rather than narrative because the expression of feelings is foremost.

Summary

Form

Although instrumental accompaniment is almost universal in the blues, the blues is essentially a vocal form. Blues songs are lyrical rather than narrative; blues singers are expressing feelings rather than telling stories. The emotion expressed is generally one of sadness or melancholy, often due to problems of love but also oppression and hard times. To express this musically, blues performers use vocal techniques such as melisma (sustaining a single syllable across several pitches), rhythmic techniques such as syncopation, and instrumental techniques such as “choking” or bending guitar strings on the neck or applying a metal slide or bottleneck to the guitar strings to create a whining voicelike sound. As a musical style, the blues is characterized by expressive “microtonal” pitch inflections (blue notes), a three-line textual stanza of the form AAB, and a 12-measure form. Typically the first two and a half measures of each line are devoted to singing, the last measure and a half consisting of an instrumental “break” that repeats, answers, or complements the vocal line. In terms of functional (i.e., traditional European) harmony, the simplest blues harmonic progression is described as follows (I, IV, and V refer respectively to the first or tonic, fourth or subdominant, and fifth or dominant notes of the scale):

Phrase 1 (measures 1–4) I–I–I–I

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Phrase 2 (measures 5–8) IV–IV–I–I

Phrase 3 (measures 9–12) V–V–I–I

Get a Britannica Premium subscription and gain access to exclusive content. Subscribe Now African influences are apparent in the blues tonality, the call-and-response pattern of the repeated refrain structure of the blues stanza, the falsetto break in the vocal style, and the imitation of vocal idioms by instruments, especially the guitar and harmonica.

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Why is D7 called D7?

This is a quick guide and free chord chart for the D7 chord. D7 is what is called a “dominant 7th chord”. It is based on a major triad, but adds a minor 7th note to create the dominant 7th chord. This creates a very classy and elegant sound, that is neither major nor minor sounding, but actually both at the same time.

professionalcomposers.com - D7 Chord on Piano (Free Chart) - Professional Composers

How to Play the D7 Chord on Piano

As with all 7th chords, you can play them in 4 different ways depending on the order you choose for the chord notes. Chord inversions are named from the bass note (meaning the lowest chord note in the voicing you choose), like this: C/G (where G is the lowest note). If there is no slash, it means the chord should be played in standard root position.