Chord chart
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A chord chart is a form of musical notation that describes the basic harmonic and rhythmic information for a song or tune. It is the most common form of notation used by professional session musicians
Grille harmonique
Grille harmonique 2
Chord progression
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In a musical composition, a chord progression or harmonic progression is a succession of chords. Chord progressions are the foundation of harmony in Western musical tradition from the common practice
Chord chart
…Nashville notation or Nashville number system is a method of notating chord changes using numbers based on scale degrees, in lieu of chord names. For example, in the key of C major, the chord D minor seventh can be written as 2−7, 2m7…
Blues progressions influenced a great deal of 20th century American popular music