When written as closely as possible on a staff, the two upper notes of a triad must form a third and a fifth-or compound third and fifth-above the lowest note. For a chord to be a triad, the pitches contained therein must combine to create specific intervals. Not all three-note chords are triads, however. (Most people reserve these terms for sonorities with three or more pitches, though an interval may also be considered a type of chord.) A triad, as the name implies, is a type of chord made up of three unique pitch classes. 13.2 Structure and spellingĪ chord or harmony is a musical sonority consisting of two or more pitches. We also will describe a widely-used system for labeling triads in a key using Roman numerals and the various analytical applications in which these labels come in handy. In this chapter we will discuss the construction of triads and the different types one encounters. Harmonies such as these are known as triads and they appear in virtually every piece of tonal Western art music. With the exception of the final measure, all of the sonorities in Example 13–2 look and sound remarkably similar: three-note stacks of thirds differing only in their position on the staff.
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