"Tonight" (Korean: 투나잇; Revised Romanization: Toonait) is a song by South Korean boy band Big Bang released on February 23, 2011 through YG Entertainment as the only single from the quintet's fourth extended play of the same name after a two year hiatus. Co-written by members G-Dragon and T.O.P, the song peaked at number one on the Gaon Music Chart.

Following a two-year hiatus where members explored and experimented with different sounds, Big Bang returned to South Korea with their 2011 Big Show concert, showcasing songs from the then-unreleased EP. Though the group's previous extended plays contained songs that were heavily influenced by electronic music, they opted to concentrate more on "warm rock music" for new materials. Released as the only single, "Tonight" was praised for its "sophisticated electronic sound" paired with acoustic guitar.Billboard noted how it was "more nuanced and sophisticated than many of [Big Bang's] previous club anthems," ranking it number ten on their list of Big Bang's must-listen songs. The Korean media news website Allkpop view it as one of the "highlights" of the EP.

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