Humdrum lab 8
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chorck
Chorck is a Humdrum Extras tool for checking the part-writing syntax of chorales. documentation for the chork tool
Eight syntax rules are checked by the program, as defined in the music-theory textbook: . Tonal Harmony with an Introduction to Twentieth-Century Music by Stefan Kostka and Dorthy Payne:
- Parallel 5ths between two voices when moving to different pitch classes.
- Parallel Octaves between two voices when moving to different pitch classes.
- Contrary parallel 5ths -- when two voices move in parallel 5ths displaced by an octave. (such as an octave and a fifth going to a fifth)
- Unequal 5ths -- when the bass part and another voice move from dim 5ths to perfect 5ths or vice versa.
- Hidden 5ths -- when the soprano moves in similar motion with another voice and the soprano leaps to a perfect 5th with that voice.
- Hidden 8va -- when the soprano moves in similar motion with another voice and the soprano leaps to a perfect octave with that voice.
- Voice crossing -- when an inner voice goes above the soprano voice or below the bass voice.
- Open spacing -- when the interval between successive voices other than the bass exceeds an octave.
How many times does Bach violate the rules?
chorck chor*.krn -w | wc -l
List of the rule violations by type
chorck *.krn -w | sed 's/between.*//' | sortcount 647 7. Voice crossing 491 5. Hidden 5th 441 8. Open spacing 243 6. Hidden octave 93 4. Unequal 5th 61 3. Contrary parallel 5th 36 1. Parallel 5th 6 2. Parallel octave
List of the rule violations by voice pairs
$ chorck *.krn -w | sed 's/on line.*//' | sortcount 338 8. Open spacing between alto and tenor 329 7. Voice crossing between tenor and bass 202 5. Hidden 5th between soprano and alto 191 5. Hidden 5th between soprano and tenor 174 6. Hidden octave between soprano and tenor 156 7. Voice crossing between soprano and alto 103 8. Open spacing between soprano and alto 98 5. Hidden 5th between soprano and bass 84 7. Voice crossing between alto and bass 78 7. Voice crossing between soprano and tenor 46 6. Hidden octave between soprano and bass 37 4. Unequal 5th between bass and soprano 32 4. Unequal 5th between bass and alto 24 4. Unequal 5th between bass and tenor 23 6. Hidden octave between soprano and alto 19 3. Contrary parallel 5th between bass and alto 18 3. Contrary parallel 5th between tenor and soprano 14 1. Parallel 5th between tenor and soprano 12 1. Parallel 5th between tenor and alto 11 3. Contrary parallel 5th between bass and tenor 7 3. Contrary parallel 5th between bass and soprano 6 3. Contrary parallel 5th between tenor and alto 4 1. Parallel 5th between bass and soprano 3 1. Parallel 5th between bass and tenor 3 2. Parallel octave between bass and alto 2 2. Parallel octave between bass and tenor 2 1. Parallel 5th between bass and alto 1 2. Parallel octave between tenor and soprano 1 1. Parallel 5th between alto and soprano
cint
cint is a tool that extract counterpoint modules from polyphonic music.
parallel thirds
The three-interval counterpoint module for stepwise rising parallel thirds is "3 2 3". this can be done as a filter in VHV:
!!!filter: cint -O --search "3 2 3"
The -O option collapses intervals greater than an octave to less than an octave, such as 10th (an octave plus a 3rd) being transposed to 3rds.
