In 1995, at the height of grunge music, 15-year-old twin sisters Tegan and Sara Quin started their first band in Calgary, Alberta, Canada. The band was called Plunk and consisted of only two members: Tegan and Sara. Back then everyone called the twins Sara and Tegan, and outside school they mostly holed up in their bedrooms, crafting their first punk-inspired songs on their shared guitars. After graduation, Plunk (a play on “light punk”) briefly became Sara and Tegan, but the sequence…