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t.A.T.u. was a Russian pop duo consisting of Lena Katina and Yulia Volkova. Formed in 1999, the group gained international recognition for their provocative lyrics and music videos, which often explored themes of sexuality and rebellion. t.A.T.u. released several hit singles, including "All the Things She Said" and "Not Gonna Get Us," and became one of the most successful Russian pop acts of all time.