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One simple chord substitute for IV is the "ii" chord, a minor chord built on the second scale degree. In the key of C major, the "ii" chord is "D minor", which is the notes "D, F, and A". As there are two shared notes between the IV and "ii" chords, a melody that works well over IV is likely to be supported by the "ii" chord.
A contrafact is a musical composition built using the chord progression of a pre-existing song, but with a new melody and arrangement.Typically the original tune's progression and song form will be reused but occasionally just a section will be reused in the new composition.
For example, if a tune is in the key of C, if there is a G chord, the chord-playing performer usually voices this chord as G 7. While the notes of a G 7 chord are G–B–D–F, jazz often omits the fifth of the chord—and even the root if playing in a group. [2]
A chord chart. Play ⓘ. A chord chart (or 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 playing jazz or popular music.
Though power chords are not true chords per se, as the term "chord" is generally defined as three or more different pitch classes sounded simultaneously, and a power chord contains only two (the root, the fifth, and often a doubling of the root at the octave), power chords are still expressed using a version of chord notation.
The numbers do not change when transposing the composition into another key. They are relative to the new Tonic. The only required knowledge is the major scale for the given key. Unless otherwise noted, all numbers represent major chords, and each chord should be played for one measure. So in the key of C, the Nashville Number System notation:
A common chord progression with these chords is I-♭ VII–IV-I, which also can be played as I-I-♭ VII–IV or ♭ VII–IV-I-I. The minor-third step from a minor key up to the relative major encouraged ascending scale progressions, particularly based on an ascending pentatonic scale. Typical of the type is the sequence i–III–IV (or iv ...
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.