In music theory, a pitch simultaneity is more than one pitch or pitch class all of which occur at the same time, or simultaneously: "A set of notes sounded together.
For example, arpeggios are chords whose tones are not simultaneous.
"The practice of harmony typically involves both simultaneity...and linearity.
Similarly, simultaneity succession is a more general term than chord progression or harmonic progression: most chord progressions or harmonic progressions are then simultaneity successions, though not all simultaneity successions are harmonic progressions and not all simultaneities are chords.
This music theory article is a stub.