Claim: John Kiffmeyer was once in a punk rock musical band.
Evidence: John Kiffmeyer -LRB- born July 11 , 1969 -RRB- , known professionally in music as Al Sobrante , is an American musician , best known as the former drummer for the punk rock band Green Day.
Green Day is an American punk rock band formed in 1986 by lead vocalist and guitarist Billie Joe Armstrong and bassist Mike Dirnt.