The Chipmunk Song (Christmas Don't Be Late) - Chipmunks' ACTUAL Voices

The "Chipmunks" voices have been put into their normal pitch. All 3 were the actual voice of the singer, David Seville.
Ross Bagdasarian (David Seville's actual name and the composer of this tune), experimented with a reel-to-reel tape recorder to re-create the sound technique that MGM had used to produce The Wizard of Oz‘s Munchkin voices 20 years earlier. In short, the process involves recording a voice at half-speed and playing it back at normal speed, which raises the pitch (the trick: a laboriously slow delivery of the lyrics).