Darren Criss — Glee
Darren Criss was an Internet sensation before he became the Glee star he is today. His online Harry Potter production, A Very Potter Musical, made huge waves in the world when songs Darren co-wrote (and sang, as Harry) made it on the Billboard Top Cast Albums chart in 2010. He also released an EP called Human the same year. These days, he has a comfy chair in the top lists of music, singing the best songs on Glee as Blaine Anderson.