In rock and popular music, examples of songs that "emphasize parallel keys," include Perfect Day, Grass Roots' "Temptation Eyes", Lipps Inc's "Funkytown" and Dusty Springfield's You Don't Have To Say You Love Me.
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Following Lewin's revival (in GMIT) of Hugo Riemann's three contextual inversion operations on triads (parallel, relative, and Leittonwechsel) as formal transformations, the branch of transformation theory called Neo-Riemannian theory was popularized by Brian Hyer (1995), Michael Kevin Mooney (1996), Richard Cohn (1997), and an entire issue of the Journal of Music Theory (42/2, 1998).