Drop 2-4 voicings drop both the second and fourth voices from a close position voicing, creating a very wide spread. This is an advanced technique covered in arranging texts.
Drop 2-4 is the most extreme drop voicing: take a close position chord and drop BOTH the 2nd and 4th notes from the top down an octave. The left hand gets two notes, the right hand gets two notes, with a wide gap in between. It creates the widest possible four-note voicing.
Take close position [1, 2, 3, 4 from bottom]. Drop notes 1 and 3 (2nd and 4th from top) each down an octave. Result: [1-12, 2, 3-12, 4].
When you want maximum register separation — the sound is almost orchestral. Advanced technique that requires comfort with drop 2 and drop 3 first. Particularly effective in ballads and rubato passages where the wide spacing can ring and resonate.
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