Green Day have undergone a few dramatic changes over the years. They’ve grown from being a straight up pop-punk band to one that seemingly knows no boundaries. They’ve dabbled with elements of 60s rock (the title track from their 2000 album ‘Warning’ brazenly ripped off The Kinks and the same album took in other retro styles previously untouched by the trio); delivered one of their generation’s most pointed political statements (‘American Idiot’); dabbled with a rock opera (’21st Century Breakdown’) and even staged a piece of musical theatre based on the ‘American Idiot’ album. Through it all, they have held on to a very loyal fanbase. You could accuse Green Day of many things (even becoming dull, as evidenced on their ‘Uno’, ‘Dos’ and ‘Tre’ trilogy from 2012), but you could never accuse them of standing still.