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Probable error in Trope 21


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Dear All,

The second half of trope 21 is showing a note repetition.

(trope-hexachord 21)

((c4 b3 bb3 eb3g3a3) (d3fs3gs3 cs3f3 fs3))

 

The pitch-class  fs3 appears twice, comprising a 5 note set (it should be an hexachord, a 6 note-set)

(d3fs3gs3 cs3f3 fs3))

 

According to Sedivy (2011, pg 134) the trope 21 is shown below:

 

image.png.384d8e2299541236ccb9146b6851809f.png

 

In Sedivy´s book, this trope are shown starting in E, thus

 

(pitch-transpose -8 (trope-hexachord 21)), thus

 

((e3 eb3 d3 g2b2cs3) (fs2bb2c3 f2a2 bb2))

 

There is a repetition of two Bb pitch classes in the second hexachord

(pitch-transpose -8 (melodize (last (trope-hexachord 21))))

 

((fs2 bb2 c3 f2 a2 bb2))

 

According to the book, the last note should be an Ab, not a Bb, like

 

((e3 eb3 d3 g2b2cs3) (fs2bb2c3 f2a2 ab2))

 

All the best !

Julio

 

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