Fans of the legendary rock band Iron Maiden will have something to smile about today with word of a new documentary entitled Iron Maiden: Flight 666. The documentary will give a very intimate look behind the scenes at the band on the first leg of their Somewhere Back In Time tour, which spanned 23 shows and 13 countries in 45 days back in February/March 2008.

The film was made by Scot McFadyen and Sam Dunn from Banger Produstions, who are known for other acclaimed music-based films such as Metal, A Headbangers Journey as well as Global Metal.

April 21, 2009 will be known as Iron Maiden Day in honor of the band and as the film is released in select theaters and shown on digital screens simultaneously around the world.

Check out a detailed description of the documentary on the other side.

In the history of rock music, band members have come and gone, but nothing is more controversial or dangerous then installing a new lead singer in an established rock outfit. Does it help or hinder to replace your frontman or is it just plain blasphemy to even consider this practice?

This November, prog-rock band Yes will be embarking on a 40th anniversary tour without their lead singer Jon Anderson, who was forced to bow out because of illness. In Anderson’s stead on Yes’s “In the Present” tour will be Benoit David, who sings in a few Yes tribute bands out of Montreal, Canada.

Depending on fan reaction, this former tribute singer is either headed for superstardom or is very doomed.

Here’s a look at 10 rock bands that have replaced their lead singer and the subsequent outcome of their decisions.