It is a tribute to Anette Olzon, all videos used is here:

www.youtube.com/watch?v=OAgnGyCUk_s
www.youtube.com/watch?v=9HNIXY0clZk
www.youtube.com/watch?v=MPHmlkycqWw
www.youtube.com/watch?v=jH6r5AMK4h0
www.youtube.com/watch?v=_WrjVuFD188
www.youtube.com/watch?v=2xlGsU-ZZS8
www.youtube.com/watch?v=AlfA1JbqQD0