tonality

Concise Oxford English Dictionary © 2008 Oxford University Press:
tonality/təʊˈnaləti/

▶noun (pl. tonalities)

• 1 the character of a piece of music as determined by the key in which it is played or the relations between the notes of a scale or key.

  ■ the use of conventional keys and harmony as the basis of musical composition.

• 2 the range of tones used in a picture.