Mayday or Wu Yue Tian (五月天), is a Taiwanese rock band that originated in the late 1990s but has since become one of the biggest rock bands to hit Taiwan pop culture. As one of Taiwan's million-selling rock artists, they have received a range of accolades as well as moving records all over the world.

They are locally regarded as the best rock band after Beyond, a popular rock band that is based in Hong Kong. Mayday's songs resonate greatly with many Taiwanese youths who can identify with their themes of love, world peace and growing up. They are also influenced by The Beatles, which is their favourite group whom they aspire to be like.

Their music has the unique ability to bring the listener to his feet or move the listener to tears. They sing songs mostly in Taiwanese and Chinese although some fans profess that their Taiwanese songs are more emotional and touching. Unlike some rock bands, they also project a clean and healthy image and have never been seen smashing musical instruments willfully, drinking or gambling. Mayday represent the zeitgeist of the Taiwanese and Chinese youth who identify with the band's themes of innocence, childhood, dreams, aspirations, loneliness and determination. At the same time, the band's unique outlook on life has attracted many fans who find their views refreshing.