<human>: D.O.A. is a Canadian punk rock band from Vancouver, British Columbia. They are often referred to as the "founders" of hardcore punk along with Black Flag, Bad Brains, Angry Samoans, the Germs, Negative Trend, and Middle Class. Their second album Hardcore '81 was thought by many to have been the first actual reference to the second wave of the American punk sound as hardcore. Singer/guitarist Joey "Shithead" Keithley is the only founding member to have stayed in the band throughout its entire history, with original bassist Randy Rampage returning to the band twice after his original departure.

On April 22, 1981 the band released their second album Hardcore '81; the record's title and its extensive North American promotional tour is sometimes credited with popularizing the term "hardcore punk".  Randy Rampage was fired from the band on January 1, 1982 and was replaced by ex-Skulls drummer Dimwit on bass. After a short tour of California, Chuck Biscuits left the band and joined Black Flag. Dimwit switched back to drums and Subhumans singer Wimpy Roy was hired as the new bass player and second singer, leaving Keithley as the only remaining original member. This lineup would last from 1982-1983 and later 1985-1986 and produced several notable releases, including the EP War on 45 (now expanded into a full-length album). War on 45 found the band expanding their sound with touches of funk and reggae, as well as making their anti-war and anti-imperialist political stance more clear.  1985's Let's Wreck The Party and 1987's True (North) Strong And Free saw the band taking on a more mainstream, hard-rock oriented production, but without watering down the band's political lyrical focus. Meanwhile, the band's lineup changes continued after Let's Wreck the Party, with Dimwit replaced by Kerr Belliveau. Belliveau stayed only three weeks with the band but recorded the Expo Hurts Everyone 7" as well as two songs for True (North) Strong and Free before being replaced by Jon Card from Personality Crisis. Dave Gregg quit in 1988 after D.O.A. fired their manager Ken Lester, to which he was very close. The band hired Chris Prohom from the Dayglo Abortions as a replacement. CANNOTANSWER

Answer the following question by taking a quote from the article: What was Hardcore 81?
<bot>: On April 22, 1981 the band released their second album Hardcore '81;