Nightwing
Although Nightwing is commonly associated with Batman, the title and concept have origins in classic Superman stories. The original Nightwing in DC Comics was an identity assumed by alien superhero Superman when stranded on the Kryptonian city of Kandor with his pal Jimmy Olsen. Drawing inspiration from Batman and Robin, the two protect Kandor as the superheroes Nightwing and Flamebird. Following the Crisis on Infinite Earths continuity reboot in 1985, Nightwing was re-imagined as a legendary vigilante from Krypton whose story inspires Dick Grayson's choice of name when he leaves behind his Robin identity.
Nightwish
On October 1, 2012, Nightwish announced via their Facebook page that they were parting ways with Olzon. According to the press statement, "it has become increasingly obvious that the direction and the needs of the band were in conflict, and this has led to a division from which we cannot recover". This announcement came days after Olzon fell ill at a show in Denver, Colorado and was unable to perform. Nightwish used replacement singers from the opening band, Kamelot, and Olzon later expressed her disappointment, saying "I was never asked if it was OK that they used Elize and Alissa in the show [Friday] night [...] I don't think it's a good decision they made and I'm sorry for those of you who came to see the whole band but got something else. But I was very ill and this decision wasn't mine." According to the statement, Dutch singer Floor Jansen (ex-After Forever, ReVamp) would sing for the remainder of the Imaginaerum World Tour.