X4

X4 formed in São Paulo in 1999 with Xandão on vocals, Japinha on guitar, Tatau on bass, and Thiago on drums. Their self-titled debut album came out in 2001, followed by records like "Pura Emoção" in 2004 and "Identidade" in 2007.

Their 2003 song "Agora Eu Sei" became a major hit in Brazil, a ballad about heartbreak that connected with a wide audience. Other tracks like "Rockin It" and "Novo na Escola" show the band's range across pop styles.

X4's catalog includes straightforward pop songs and slower material, with lyrics often dealing with relationships. Their music got regular radio play in Brazil during the 2000s.