Chords that contain tones a half-step or whole-step apart are called

Answer: Tone clusters

Explanation:

Chords are a harmonic set of three or more notes that is heard as if sounding simultaneously. Chords with tones a half - (The musical interval equal (exactly or approximately) to half a tone or one-twelfth of an octave) or whole-step (The musical interval equal (exactly or approximately) to two semitones or two-twelfths of an octave) apart are known as tone clusters. Ealier though to be central to piano tone clusters can and maybe performed may be performed on instruments in which three or more notes can be played at the same time. In most western music though, tone clusters can be viewed as not exhibiting harmony and might be harsh to a listening ear.

Chords that contain tones a half-step or whole-step apart are called Tone Clusters. It is a chord made up of tones only a half step or whole step apart. It can be produced on a piano by striking a group of adjacent keys with the fist or forearm.