Twenty years ago, 16-year-old Avril Lavigne started working on songs for her first album, Let Go. With massive early hits like “Complicated” and “Sk8er Boi,” Avril quickly became a force to be reckoned with in mainstream pop, bringing a pop-punk sound and skater influences into the spotlight with her — and becoming one of the first women to have worldwide success in the very male-dominated space. To this day, Let Go remains one of the best-selling albums by a Canadian artist, and has been certified seven times platinum (!). Following up her debut with 2004’s Under My Skin and 2007’s The Best Damn Thing — which spawned her first No. 1 hit, “Girlfriend” — by 21, Lavigne was a household name.