autotune, for singers who cant "sing" when they can't hit certain notes, a computer program "autotune" fixes it for them so they can hit them, result in a cool robotic sound, like the kind T-Pain sounds like (he's to blame lolz) You can tell when someone is using autotune two ways, one you can here a robotic sound, and two, you can tell the artist is struggling at certain parts (these parts are the parts that robotic sound sticks out.) Some artist who can sing do it for coolness, it's got that cool technological sound (Chris brown does it, tho he can sing, he uses autotune for songs like "forever") Then artist that cant really sing (Black Eyed Peas) use it for there songs like "I gotta feeling" you can tell Will.I.Am is struggling with some notes cuz you can here technological sound. Also there is a video of them singing I Gotta Feeling live, oh my gosh they sound TERRIBLE w/o lipsyncing. Any other questions bout autotune?