Fall Out Boy emerged in the 2000s as the biggest band in emo-pop. The Chicago quintet attracted tons of teenagers (most of them girls) to their shout-along tunes, which mixed snarky humor and big, deep-feeling choruses. As the decade wore on, Fall Out Boy continued to find new ways to market themselves — from Myspace ads to an FOB-branded video game — as the group began to sell out arenas. Pete Wentz, the band's heavily mascara'd bassist, songwriter and leader, became something of a celebrity and entrepreneur, marrying Ashley Simpson, starting a clothing company, and signing bands like Panic! At the Disco to his label, Decaydence.