A Parallel transformation occurs between two chords that share two notes (the root and the fifth) with the third note moving by a half step. In this type of transformation, a major triad will change into minor, and a minor triad will change to major.
The resulting triads will be the tonic triads in two parallel major and minor keys.
For example, a C major triad will transform to a C minor triad through a Parallel (P) Transformation.
For this transformation, the outer two notes of the two chords (in this case the C and G) will remain the same, with the other note moving by half step (E to Eb). The two resulting chords will have the same root but different qualities (major and minor), like parallel major and minor keys.
This Parallel transformation, C major -> C minor, can be visualized as:
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