7th chords can be played with less than 4 notes. A dominant 7, minor 7, major 7 can be be harmonically expressed with root, 3rd and 7th: G7-BFG, Gmin7-BbFG, Gmaj7-BF#G for example. The 3rd and 7th are what defines the chord quality. IMHO
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3 finger chords makes music much more pleasurable to play smoothly and easily.
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Slight correction; you can do dominants by skipping the 5th; like for example G7, will fully trigger with G,B, F (skipping the D).7th chords can be played with less than 4 notes. A dominant 7, minor 7, major 7 can be be harmonically expressed with root, 3rd and 7th: G7-BFG, Gmin7-BbFG, Gmaj7-BF#G for example. The 3rd and 7th are what defines the chord quality. IMHO
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