I have parsed a collection of krn files with music21 and they all consist of a number of parts. I want to remix the parts and save them as a different file.
However, for a few of the kern files music21 says that is has 0 parts:
>>> s = converter.parse('./data/Benedictus_23.krn')
>>> print len(s.parts)
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
AttributeError: 'Opus' object has no attribute 'parts' -> this really strange
>>> print len(s.voices)
0
The file does have different bars/instruments. How could I seperate/identify them? It doesn't seem to have voices either.
Here is an example header (full file)
!!!COM: Palestrina, Giovanni Perluigi da
!!!OPR: Fratres Ego Enim Accepi
!!!OTL: Benedictus
**kern **kern **kern **kern
*Itenor *Icalto *Icalto *Icant
!Tenor !Altus 2 !Altus 1 !Cantus
*clefGv2 *clefG2 *clefG2 *clefG2
*k[b-] *k[b-] *k[b-] *k[b-]
*G:dor *G:dor *G:dor *G:dor
*M4/2 *M4/2 *M4/2 *M4/2
=1 =1 =1 =1
0r 0a 0r 0r
=2 =2 =2 =2
Other krn files with for instance this header do work:
!!!COM: Palestrina, Giovanni Perluigi da
!!!OPR: Dum esset summus pontifex
!!!OTL: Gloria
**kern **kern **kern **kern
*Ibass *Itenor *Icalto *Icant
!Bassus !Tenor !Altus !Cantus
*clefF4 *clefGv2 *clefG2 *clefG2
*k[] *k[] *k[] *k[]
*A:aeo *A:aeo *A:aeo *A:aeo
*M4/2 *M4/2 *M4/2 *M4/2
=1 =1 =1 =1
1.A 1.c# 1.e 1.a
Any idea on how to seperate the instruments? Or properly read in the parts?
Apparantly the pieces consists of multiple opusses.
You can get the different streams t like this:
s = converter.parse('./data/Benedictus_23.krn')
try:
numscores = len(s.scores)
except:
numscores = 0
#for each opus
if numscores > 0:
for score in range(0,numscores):
sys.stdout.write('\n -> opus ' + str(score))
t = s.scores[score]
print len(t.parts)