The origins of 1990s punk pop can be seen in the more song-oriented bands of the 1970s punk movement like The Buzzcocks and The Clash, commercially successful New Wave acts such as The Jam and The Undertones, and the more hardcore-influenced elements of alternative rock in the 1980s. 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 andGreen 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. They were soon followed by the eponymous début from Weezer, which spawned three top ten singles in the US. This success opened the door for the multi-platinum sales of metallic punk band The Offspring with Smash (1994). This first wave of pop punk reached its commercial peak with Green Day's Nimrod (1997) and The Offspring's Americana (1998).
A second wave of punk pop was spearheaded by Blink-182, with their breakthrough album Enema of the State (1999), followed by bands such as Good Charlotte, Bowling for Soup and Sum 41, who made use of humour in their videos and had a more radio-friendly tone to their music, while retaining the speed, some of the attitude and even the look of 1970s punk. Later pop-punk bands, including Simple Plan, All-American Rejects and Fall Out Boy, had a sound that has been described as closer to 1980s hardcore, while still achieving considerable commercial success.