Canadian rock band Sum 41 talks to Billboard's Lyndsey Havens about their farewell world tour, what inspired their double album 'Heaven :x: Hell,' how it feels for them to be winding down their career, the reaction they received when they announced they were disbanding, how they feel about the sustainability and longevity of their 30 year career, which memory over the span of their career is the most heaven like and most hell like and more!