Love it or hate it, Auto-Tune has changed pop music. From Cher's "Believe" to Kanye West's "Love Lockdown," the sound has penetrated the globe and revolutionized music since its invention in 1997. Some say the pitch-correction technology has ruined music, while others have found fame by using the tool creatively. Tracing Auto-Tune's roots to predecessors like the synthesizer, the good, the bad, and the ugly of this game-changing technology is revealed, grounded in a personal account of Auto-Tune's most famous user, T-Pain.