The stars of 2012, online and on air (from left): Nate Ruess of fun., Gotye, Carly Rae Jepsen and Psy. Matt Roberts/Getty Images, Tony Nelson/Corbis Images, Kevin Winter/Getty Images, Kevin Winter/Getty Images hide caption

itoggle caption Matt Roberts/Getty Images, Tony Nelson/Corbis Images, Kevin Winter/Getty Images, Kevin Winter/Getty Images

Released in December, Carly Rae Jepsen's "Call Me Maybe" has been rising on the charts — it reaches no. 5 this week — and winning the hearts of fans on YouTube. Vanessa Heins/Courtesy of the artist hide caption

itoggle caption Vanessa Heins/Courtesy of the artist