Used by stars from Snoop Dogg and Lil Wayne to Britney Spears and Cher, the use of Auto-Tune has been widely criticized as indicative of an inability to sing on key. Trey Parker used Auto-Tune on the "South Park" song "Gay Fish", and found that he had to sing off-key in order to sound distorted; he claimed, "You had to be a bad singer in order for that thing to actually sound the way it does. If you use it and you sing into it correctly, it doesn't do anything to your voice." Electropop recording artist Ke$ha has been widely recognized as using excessive Auto-Tune in her songs, putting her vocal talent under scrutiny. Music producer Rick Rubin wrote that "Right now, if you listen to pop, everything is in perfect pitch, perfect time and perfect tune. That's how ubiquitous Auto-Tune is." "Time" journalist Josh Tyrangiel called Auto-Tune "Photoshop for the human voice".