I still remember the first time I heard Cher’s “Believe” while in college … I didn’t like the song, but it felt like something important was happening musically at a time that innovation was needed on the radio as we recovered from mid 90’s pop-rock in the post-grunge / machine-rock / neo-reggae era…

Rihanna is the dominant singer of our era, in no small part because the Barbados grain of her voice interacts well with Auto-Tune’s nasal tinge, making for a sort of fire-and-ice combination. Voice effects have been prominent in many of her biggest hits, from the “eh-eh-eh-eh-eh” pitch descents in “Umbrella” to the melodious twinkle-chime of the chorus in “Diamonds.” Then there’s Katy Perry, whose voice is so lacking in textural width that Auto-Tune turns it into a stiletto of stridency that—on songs like “Firework” and “Part of Me”—seems to pierce deep into the listener’s ear canal.

— Read on pitchfork.com/features/article/how-auto-tune-revolutionized-the-sound-of-popular-music/