Assertion: contralto's voice | /r/HasProperty | the cantus firmus
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Source sentences:
text: Ha mossSoprano quanto basta per commettere Mozart wrote three entries from scratch, because the fourth voice, which is the Cantus Firmus, had already been given, but in practice, he wrote a piece for only two voices, having dealt [...] with the bass as a support for the [...] Tenor, moving the Alto and Soprano just enough to make mistakes with eighths and fifths.