Article continues below advertisementIt's safe to say Jonathan Groff was always ready to take on the role of Bobby Darin, a prominent pop singer in the 1950s, known for his hits, including "Mack the Knife," "Dream Lover" and "Splish Splash."Eight years ago, the Broadway star, who plays Darin in Alex Timbers' new musical Just in Time, was asked to do a "night of Bobby Darin music at the 92nd Street Y, and I started looking up clips on YouTube," he recalled. Article continues below advertisementSource: Photo by Matthew Murphy and Evan ZimmermanJonathan Groff plays Bobby Darin in 'Just in Time.