The songs "Bad for Good" and "Cause I Love You" came from the band's archives and this was the first time Scorpions collaborated with Dierks in 14 years.

Drummer James Kottak said: "We would sit in the back of the tour bus late night, playing each other songs each of us had written, writing, listening to new stuff on the radio, and brainstorming what each one of us thought which direction should the new CD take".

[5] The band had the back lounge of a tour bus converted into a studio to write, rehearse and record the demos of the new songs.

"[6] After finishing the North American tour with Whitesnake in late March 2003, band members gathered at Scorpio Sound Studio to record the first batch of demos.

[5] In the late July and early August, Scorpions embarked on a three-week tour where Kottak spent most of his time writing, demoing, and playing guitar.

At the top of their list were: Bob Rock, Rick Parashar, Max Martin, Dieter Dierks and Erwin Musper.

Rock was on vacation and resting after the two-year production of Metallica's album St. Anger; Dierks was scrapped after a financial disagreement between him and members of Scorpions.

[5] Kottak invited Jeff Pilson and Jimmy Bain for the recording sessions, but scheduling clashes prevented their attending.

[13] In late June 2004 Scorpions official website released samples of the two bonus tracks that appear on the Japanese edition of Unbreakable; those songs are: "Dreamer" and "Too Far".