Pop group Hanson took to the stage in New York on Monday night (17Jun13) to celebrate the band's 21st anniversary. The trio of brothers, Zac, Taylor, and Isaac, first started performing together in the early 1990s, before hitting the big time with their phenomenally successful track MMMBop in 1997. And to mark their 21st anniversary as a band, the siblings performed a special gig at Irving Plaza in the Big Apple. They played a series of songs from their six album, but made the 21st tune of the night a special one - MMMBop. Taylor told the crowd, "We are going to celebrate 21 years of music."