Have you ever heard of programmed speech? How about programmed singing? If you said yes to either to the two questions, You have probably heard of VOCALOID. VOCALOID in essence is an artificial synthesizer (made by YAMAHA co)to be used commercially and professionally(or personally,Don't worry I won't judge you) to create life-like singing. Its signal processing part was developed through a joint research project led by Kenmochi Hideki at the Pompeu Fabra University in Barcelona, Catalonia, Spain, in 2000 (the same team that later founded Voctro Labs) and originally was not intended to be a full commercial project. Backed by the Yamaha Corporation, it developed the software into the commercial product "Vocaloid."
Also to note that vocaloid also has cultural impact on society.Since the release of "Hatsune Miku" developed by Crypton Future Media's success and "her" success has led to the popularity of the Vocaloid software in general.Japanese video sharing website Nico Nico Douga played a fundamental role in the recognition and popularity of the software. A user of Hatsune Miku and an illustrator released a much-viewed video, in which "Hachune Miku", a super deformed Miku, held a Welsh onion (leek) (Negi in Japanese) and sang the Finnish song "Ievan Polkka" like the flash animation "Loituma Girl", on Nico Nico Douga.
Vocaloid was sold as a product for professional musicians, and although there were many producers using the software within Japan by 2011, a report was released detailing the true reflections of the Vocaloid craze. It was conducted independently by fans of the Vocaloid software and detailed the popularity of certain Vocaloids over others. Most Vocaloid related videos struggled to get over 5,000 views and the most popular producers gaining the most interest over lesser popular producers.
Sources: Wikipedia - Vocaloid