Duo Mia and the Moon have become the first group through to bootcamp on The X Factor 2012.
Sisters Laura and Mary-Ann told The Xtra Factor host Caroline Flack that they are singing in memory of a pet pigeon they once had.
Mary-Ann said: “Our mum has loved animals since she was tiny and we’ve always had random pets coming in and out. Anything from horses, to dogs, to birds of prey, to rodents. Anything and everything.”
Laura added: “A pigeon called Pickle.”
Mary-Ann continued: “Do you remember when Pickle and Leo the kitten played together? Really sad story though, because Pickle went outside one day, on his own, and I think he went up to another cat and thought that cat would be just as friendly, and that was the end of his life. He died.”
Laura added: “We’re doing this for Pickle.”
The girls performed Shackles by Mary Mary at the auditions in Manchester.
"You sound amazing together," Louis said.
Gary raved: "You're very talented girls and I think you did a great audition today."
Even hard to impress guest judge Mel B was impressed, telling the girls: "It had me mesmerised a bit, and I liked it."
Completing the line up of four yeses, Louis told the pair: "You're so different an so fresh, it's like being at a festival."
Browse pictures of the pair's performance below...