Mayday (Chinese: 五月天; pinyin: Wǔ Yuè Tiān; Pe̍h-ōe-jī: Gō͘-goe̍h-thiⁿ) is a Taiwanese band that debuted in 1999 with five members, Monster (leader, lead guitar), Ashin (vocal), Stone (rhythm guitar), Masa (bass) and Kuan-you (drums).