Vocaloid

A popular voice mimicking software originally made by Yamaha, though development has been took over by Crypton Future Media. One types in sounds and a 'voicebank' (recording of a human of all sounds in different pitches) will sing it. There is a multitude of these voicebanks for it including the renowned 'Hatsune Miku' Hatsune Miku is a hugely popular 'virtual diva' made for the Vocaloid 2 software, she has a high voice and she has received complaints about being inhumanly high. The Hatsune Miku append was created adding a number of added voices of different tones/emotions to make for better songs. She is receiving an English update for Vocaloid 3, and is looking to be promising as of now. There is many other, and in my opinion better voicebanks, but that doesn't mean some people who claim to be Vocaloid fans actually have never heard of any other than Miku.