The simple unitary structure is in its glory in the music of Bach.
The opening four measures of the Prelude in C major in volume one of the Well-Tempered Clavier are a perfect example. The harmony is a simple statement of the basic [I-IV-V-I] progression. The [IV] and [V] chords are not in root position, which is common in this type of phrase.
The opening four measures of the Prelude in C minor are another simple statement of the basic [I-IV-=V-I] progression, this time with a pedal point in the bass. This is also common.
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