def corpusMelodicIntervalSearch(show = True):
# this version compares china to netherlands
from music21 import corpus
from music21.analysis import discrete
mid = discrete.MelodicIntervalDiversity()
groupEast = corpus.search('shanxi', field='locale')
groupWest = corpus.search('niederlande', field='locale')
msg = []
for name, group in [('shanxi', groupEast), ('niederlande', groupWest)]:
intervalDict = {}
workCount = 0
intervalCount = 0
seventhCount = 0
for fp, n in group:
workCount += 1
s = converter.parse(fp, number=n)
intervalDict = mid.countMelodicIntervals(s, found=intervalDict)
for key in sorted(intervalDict.keys()):
intervalCount += intervalDict[key][1] # second value is count
if key in ['m7', 'M7']:
seventhCount += intervalDict[key][1]
pcentSevenths = round(((seventhCount / float(intervalCount)) * 100), 4)
msg.append('locale: %s: found %s percent melodic sevenths, out of %s intervals in %s works' % (name, pcentSevenths, intervalCount, workCount))
# for key in sorted(intervalDict.keys()):
# print intervalDict[key]
for sub in msg:
if show == True:
print (sub)
def corpusFindMelodicSevenths(show=True):
# find and display melodic sevenths
import os
from music21 import corpus
from music21.analysis import discrete
mid = discrete.MelodicIntervalDiversity()
groupEast = corpus.search('shanxi', 'locale')
groupWest = corpus.search('niederlande', 'locale')
found = []
for name, group in [('shanxi', groupEast), ('niederlande', groupWest)]:
for fp, n in group:
s = converter.parse(fp, number=n)
intervalDict = mid.countMelodicIntervals(s)
for key in sorted(intervalDict.keys()):
if key in ['m7', 'M7']:
found.append([fp, n, s])
results = stream.Stream()
for fp, num, s in found:
environLocal.printDebug(['working with found', fp, num])
# this assumes these are all monophonic
noteStream = s.flat.getElementsByClass('Note')
for i, n in enumerate(noteStream):
if i <= len(noteStream) - 2:
nNext = noteStream[i + 1]
else:
nNext = None
if nNext is not None:
#environLocal.printDebug(['creating interval from notes:', n, nNext, i])
i = interval.notesToInterval(n, nNext)
environLocal.printDebug(['got interval', i.name])
if i.name in ['m7', 'M7']:
#n.addLyric(s.metadata.title)
junk, fn = os.path.split(fp)
n.addLyric('%s: %s' % (fn, num))
m = noteStream.extractContext(
n, 1, 2, forceOutputClass=stream.Measure)
m.makeAccidentals()
m.timeSignature = m.bestTimeSignature()
results.append(m)
if show == True:
results.show()