There are several artists with the same or a similar name:
1) Tatu (meaning "three" in Swahili) were an Australian girl trio formed in 2000, the name was chosen as one of the members was born in Kenya. Their single was called Imperfect Girl with B-side Perfect. See the YouTube and other links in the sources.
2) A Japanese keyboarder composing symphonic music aka tatu4 on Twitter, released an album called Requiem, see his Soundcloud and TMBox pages in the sources.
3) Incorrect tag for t.A.T.u., the Russian girl duo consisting of Lena Katina and Yulia Volkova. See the Wikipedia article in the sources: "After completing the duo, the producers decided on the name "Тату" (Tatu). Sounding like the English word "tattoo", it is also a shortening hint to the Russian phrase "Эта девочка любит ту девочку", meaning "This girl loves that girl". For the release of their first English-language album, they decided to go by t.A.T.u., using uppercase letters and periods to distinguish themselves from an already existing Australian band, Tatu."