Here is a webpage for singers to practice the Opera Matsukaze.
Full soloist part in a conducted video (piano version with choir chords):
PS: You can jump to different scenes in the description of the video (on Youtube website or App).
NB: numbers on the top right corner are the rehearsal numbers of the score
Microtonal practice for the 2 sisters:
2 voices
Practise for voice 1
Practise for voice 2