Ever since Cher transformed her voice into a synthetic warble for her 1998 single "Believe", auto-tune has transformed the way pop vocals are recorded. Within a year of the hit, inventor Andy Hildebrand had sold the technology to every major studio in the world.
Pretty soon the technology wasn't just a stylistic choice - producers began to conceal imperfections in singers' voices. Artists like T-Pain used it blatantly and openly (to the extent that the singer tried to sue the makers of Auto-tune), whilst others (like Britney Spears) used it for more deceptive ends. Soon enough, it became synonymous with artistic laziness, gaining criticism from all corners of the music industry. These detractors ranged from Death Cab For Cutie to Jay Z (although the latter seems to have changed his, um, tune).
As the technology progressed, so too did its insidiousness; auto-tune can now easily be used to enhance live vocals, as evidenced by Gamu Nhengu's notorious 2010 X-Factor audition, as her voice was audibly yanked on key.
Despite this, some artists have carried on in the spirit of Cher, using it as an artistic tool, not a shortcut. Here are eight of its most inspired uses, where auto-tune augments the singer's vocals in interesting ways.