Thus, the term tone painting is quite appropriate, in that Debussy's compositions often experimented with a much broader palette of tones, allowing each to behave similar to a colour within an illustration. The use of the term tone paintings here describes the nature of a large portion of Debussy's work which was concerned with mood and colour, eschewing traditional tonality in favour of constructions such as the full-tonal scale, parallel chords, bitonality, and to a certain extent atonality, in order to achieve a greater degree of musical expression not allowed by strict adherence to a single key.