A fascinating if heavily one-sided documentary about the legendary Finnish symphonic metal band's sudden transition between vocalists during a tour of the US.

It's one-sided because the former vocalist, Anette Olzon, denied use of any of her footage to be used. So we don;t get her side of the situation.

What we do get is Dutch vocal virtuoso Floor Jansen coming in and completely blowing away all prevous Nightwish vocalists. The title refers to the alleged amount of time Jansen had to learn so many Nightwish songs.

Her climactic rendition of 'Ghost Love Score' will raise the hairs on the arms of anybody watching, and leave you with no doubt as to who the true singer for Nightwish should be.