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How to apply different voicings over a chord progression Sometimes you have to spread the notes of a chord progression in a very specific way, specially in the case of sectional writing as in the big bands, for example, where specific voicings are used, commonly named as drop2, drop3, etc. All the voicings are based in the initial closed position: - DROP2 is obtained by dropping the 2nd voice an octave below, as shown below: - DROP3 is obtained by dropping the 3rd voice an octave below, as shown below: There are 24 types of voicings as shown in the image below. The rule is to not exceed the octave between two adjacent voices. VOICING TYPES From Combinatorial Harmony Book, avaiable at: https://www.melbay.com/Products/Default.aspx?bookid=30042BCDEB CLOSED, DROP2, DROP3, DROP2+4, DROP2+3 and DOUBLEDROP2+ HOW TO IMPLEMENT IN OPUSMODUS EXAMPLE ;;; SOME Seventh CHORDS TO USE (setf chords '((a4c4d4f4) (c5eb4f4gs4) (d5f4g4bb4) (cs5e4fs4a4) (e4f4a4c4) (fs4g4b4d4) (d4eb4g4bb3) (eb4e4gs4b3) (e4g4a4c4) (a4c5d5f4) (f4gs4bb4cs4) (d4f4g4bb3) (fs5g4b4d5) (b5c5e5g5) (a5bb4d5f5) (gs4a3cs4e4) (b4d4e4g4) (d5f4g4bb4) (e5g4a4c5) (eb5fs4gs4b4) (e4f4a4c4) (fs4g4b4d4) (d4eb4g4bb3) (eb4e4gs4b3))) Setting the Voicing Types: csd (Closed Position) dp2 (Drop 2) dp2 (Drop 3) dp2-4 (Drop 2+4) dp2-3 (Drop 2+3) ddp2-3 (Double Drop 2 + Drop 3) (setf csd '(0 0 0 0) dp2 '(0 -12 0 0) dp3 '(0 0 -12 0) dp2-4 '(0 -12 0 -12) dp2-3 '(0 -12 -12 0) ddp2-3 '(0 -24 -12 0)) Drop order to apply over the sequence ;;;DROP ORDER (setf droplist (flatten (list csd dp2 csd dp2-4))) Command to make the voicings over the original chord progression ;;;ABERTURAS (chordize-list (pitch-transpose-n droplist (pitch-melodize chords))) RESULT Not the expected result!!!! See the next correction!!! All the best ! Julio Herrlein An important correction: In order to produce the right voicings is it necessary to sort the notes before transposing, so the Command to make the voicings over the original chord progression is like this: VOICINGS (setf chordprogdrop (chordize-list (pitch-transpose-n droplist (sort-desc (pitch-melodize chordtrp-rpt))))) Now, the right result for the voicing order csd dp2 csd dp2-4