ADULT. began releasing albums in 1998 under the pseudonym "Plasma Co." Initially, the band members were uncredited and not publicized, but by the time Anxiety Always was released, ADULT. was listed as husband-and-wife team Adam Lee Miller and Nicola Kuperus. Miller and Kuperus are also the founders of the Ersatz Audio record label. When launching their tour in support of the D.U.M.E. EP, ADULT. announced that they had become a trio with the addition of guitarist Samuel Consiglio. The trio was short-lived – Consiglio left the band at the start of 2006.
ADULT. gained popularity while touring constantly in the United States and releasing all of their material independently. They toured with Trans Am in 2002, and in May 2003, the band made its first headlining tour in the United States; gigs across Europe followed soon after.
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