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The term blues scale refers to several different scales with differing numbers of pitches and related characteristics. A blues scale is often formed by the addition of an out-of-key "blue note" to an existing scale, notably the flat fifth addition to the minor pentatonic scale. However, the heptatonic blues scale can be considered a major scale ...
Many blues songs were developed in American folk music traditions and individual songwriters are sometimes unidentified. [1] Blues historian Gerard Herzhaft noted: In the case of very old blues songs, there is the constant recourse to oral tradition that conveyed the tune and even the song itself while at the same time evolving for several decades.
The blues chords associated to a twelve-bar blues are typically a set of three different chords played over a 12-bar scheme. They are labeled by Roman numbers referring to the degrees of the progression. For instance, for a blues in the key of C, C is the tonic chord (I) and F is the subdominant (IV).
Here, the twelve-bar progression's last dominant, subdominant, and tonic chords (bars 9, 10, and 11–12, respectively) are doubled in length, becoming the sixteen-bar progression's 9th–10th, 11th–12th, and 13th–16th bars, [citation needed]
If two chords are in the box they are each played for half a bar, etc. The chords are represented as scale degrees in Roman numeral analysis. Roman numerals are used so the musician may understand the progression of the chords regardless of the key it is played in. "Eight-bar blues chord progression": [10]
Dominant 7th chords are generally used throughout a blues progression. The addition of dominant 7th chords as well as the inclusion of other types of 7th chords (i.e. minor and diminished 7ths) are often used just before a change, and more changes can be added. A more complicated example might look like this, where "7" indicates a seventh chord:
E minor is a minor scale based on E, consisting of the pitches E, F ♯, G, A, B, C, and D. Its key signature has one sharp , on the F. Its relative major is G major and its parallel major is E major .
The progression is also used entirely with minor chords[i-v-vii-iv (g#, d#, f#, c#)] in the middle section of Chopin's etude op. 10 no. 12. However, using the same chord type (major or minor) on all four chords causes it to feel more like a sequence of descending fourths than a bona fide chord progression.