 Pop-punk tends to use power-pop melodies and chord changes with speedy punk tempos and loud guitars.Punk music provided the inspiration for some California-based bands on independent labels in the early 1990s, including Rancid, Pennywise, Weezer and Green Day.In 1994 Green Day moved to a major label and produced the album "Dookie", which found a new, largely teenage, audience and proved a surprise diamond-selling success, leading to a series of hit singles, including two number ones in the US.