What's the plural form of polytonality? Here's the word you're looking for.
Answer
The noun polytonality can be countable or uncountable.
In more general, commonly used, contexts, the plural form will also be polytonality.
However, in more specific contexts, the plural form can also be polytonalities e.g. in reference to various types of polytonalities
or a collection of polytonalities.
The effect of his polytonality is that of simultaneous movement of different planes of sound.
The idiom is essentially tonal though dissonance, bitonality, and, occasionally, polytonality are liberally used.
His language, which could take very diverse forms, was characterized by the use of polytonality.
Satie was in advance of his time with his love of bitonality, polytonality and non-triadic harmony to name but a few of his gravity-breaking techniques.
Throughout, the polytonality is permeated by the sound of the minor-ninth chord.
Utilisation of the computer allowed him to develop a musical language, which is often characterised by the use of polytonality but in a very enlarged tonal writing in order to explore various sound timbres.