TPain-Lil Wayne: Autotune/Melodyne, other pitch correction type software... and have probably moved on to a hardware version of pitch correction. Like a TC Helicon unit.
Snoop Dog: "Sexual Seduction" In his video, he shows himself using a talkbox type setup with a keyboard...but it was done using extreme pitch correction software(Autotune/Melodyne/Other)....it really pissed off a lot of talkboxers....because to be good with the talkbox, you have to put in work, learn the keyboard/piano, some music theory.
Cher's song "Believe": Not done with autotune, even the makers of Atares Autotune and Autotune EFX have it wrong...
Read on this page under "Set the desired effect type"
http://www.antarestech.com/products/auto-tune-efx.shtml
"Hard EFX is the classic Auto-Tune Vocal Effect popularized by T-Pain, Cher and many, many others."
This is how it was done: "Recording Cher's Believe"
http://www.soundonsound.com/sos/feb99/articles/tracks661.htm
Though, there is believed to be a conspiracy regarding Cher's song Believe.
Eiffel '65's song "Blue Da Ba Dee", on wikipedia, under paragraph title:
Music structure and composition
The song's(referring to "Da Ba Dee") distorted vocals were composed using a vocoder[2]. There has also been a noted similarity between the distorted vocals of "Blue (Da Ba Dee)" and "Believe" by Cher[2]. The distorted vocals of "Believe" were composed with the auto-tune effect although the producers of "Believe" went to great lengths to protect their "trade secret" by attributing the vocal sound to other technologies when interviewed.
Talkbox:
Roger Troutman, "California Love"
NB Ridaz, pretty much all their tracks have the talkbox....
Effect done using a horn driver, and a tube that is inserted in the mouth. Different notes are played via keyboard, which changes the pitch of the sound coming out the tube. The horn drivers sound goes through the tube, into your mouth. The "talkboxer" with the tube in his mouth, merely lip syncs, or shapes his mouth, as if he were saying the words.
Fingazz: Talkbox for Dummies, Autotune vs Talkbox
https://www.youtube.com/watch?v=BRZWucGpG-0
Vocoder:
Collage: "From Here to Eternity"
Daft punk: "Around the World"
Involves the vocoder unit, or plugin. A "carrier signal" which is the synth, and the "modulator", which would be the the vocals"
Depending on the type of vocoder, I will use a plugin as an example, example not typical...you pan the vocal hard right, and the synth hard left, and output those to the Vocoders input. Because the Vododer looks for the Carrier on the right, and the Modulator on the left....You then create a midi track, that will control the vocoder. Hook up a keyboard via midi. You play/record the notes on the midi track. So you are shaping the words, and giving them their pitch,.,, using the keyboard and pitch modulation wheel...
Some vocoder plugins have their own inbuilt synths....some do not require the hard left hard right complex routing. Some are external hardware units..