How has Green day changed the sound of punk?

Green Day's impact on the sound of punk is multifaceted. While they are often considered pop-punk, their music has also included elements of hardcore punk, ska, and alternative rock. Their albums, such as "Dookie" and "American Idiot," brought punk music to a wider mainstream audience and helped popularize the genre in the 1990s and early 2000s. Green Day's distinctive sound fuses catchy melodies with political and social commentary, creating a unique take on punk that has influenced many other bands within the genre.