It’s been 26 years since Britney Spears upended pop culture with her second album, Oops!…I Did It Again. It was released on May 3, and by May 28 had topped almost every global album chart. By the end of the year, it charted in the Top 5 in nine countries. Oops!…I Did It Again was massively successful and remains one of the best-selling albums of all time. In its first week, it sold 1.3 million copies, holding the record for fastest-selling album…