t.A.T.u. was a Russian music duo formed in 1999, consisting of members Lena Katina and Yulia Volkova. They gained international fame with their debut album, "200 Po Vstrechnoy," which featured hit singles like "All the Things She Said." Their provocative image and themes of love and sexuality resonated with a global audience. The duo was known for their unique blend of pop and electronic music, often incorporating elements of rock. t.A.T.u. represented a significant cultural phenomenon in the early 2000s, and they participated in the Eurovision Song Contest in 2003, further solidifying their place in music history.