
She is also regarded as one of the most used UTAU in Japan, if not the most used. Her initial release is BOUCALOID on Apwith triphones on September 17, 2011, and her second release is BOUCALOID APPEND on October 1, 2012. Many Teto songs were posted to Niconico, and Teto and UTAU established a place among VOCALOID. Tetos VCV voicebank was released on Octoand her singing became more natural than before.


Some of these early works include Fake Diva, Triple Baka, Kasane Territory, and Popipo Mk-II. Since then several creators including Lamaze-P, Telmin and Death Ohagi started to create Teto songs. The voice providers name reading was then changed to Mayo Oyamano ( Oyamano Mayo ) to avoid unnecessary confusion.

UTAU and Teto were both unnoticed among VOCALOID composers at first, but during the last half of the year of her release several creators started composing songs for Teto, causing her fame to be established during the following year. The Teto project continued after the troll campaign, and her vocal was recorded again for the use on UTAU, which vocal synthesis software was released two months earlier.
