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In this series of videos I cover Jazz Piano Improvisation techniques. I'll explain, from start to finish, how you can learn to improvise over a jazz song and sound professional.
This Jazz Piano Tutorial is about polytonality, or more specifically, bitonality. Bitonality is simply playing a scale other than the diatonic scale of the chord progression. This is a great improvisation technique when building tension.
For example, playing in A major over a chord progression in C major.
This technique can be used to create tension before resolving it back to the diatonic scale or a guide tone.
When choosing a bitonal scale to use over a chord progression, keep the following in mind:
1. The more closely related the bitonal scale is to the diatonic scale (i.e. the closer the two notes are on the circle of fifths) the more consonant or pleasant the scale will sound (e.g. laying G Major over a Chord Progression in the key of C is much more pleasant sounding than playing the Gb Major scale)
2. Choosing a scale which retains the two guide tones of the chord will make the scale sound more grounded and harmonically congruent, as the most important two notes are unchanged (e.g. playing Gb Major Scale over a G7 chord - the Gb Major scale has the notes B and F - the two guide tones of G7)
3. Side-slipping is playing a scale 1 semitone above of below the diatonic scale (e.g. playing Db Major over a chord progression in C Major). This can be a powerful tool as it builds a lot of tension which is easily resolved by just dropping down one semitone.
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