In four-part harmony (also known as SATB choral style), triads are used with one of the notes doubled. Typically, the root note is the one that gets doubled. Depending on which chord tone is in the upper voice (soprano), there are three melodic positions of the triad: the root, the third, and the fifth.
In four-part harmony, chords can be arranged in close, open, or mixed spacing. Triads are typically arranged in close and open spacing, while a mixed arrangement of triads is used only in special cases.
Compare the arrangement of triads in the example below:
Practice here
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