Timeline 1991

Crack Intro release dates are as accurate as possible. However, information on precise date of release is often not available, therefore the following scheme has been applied:

• Only year of release available:
• Intro has been marked as released on January 1st of that year.
• Only year and month of release available:
• Intro has been marked as released on 1st of provided month in year.
• No information on release date available:
• Intro has been marked as released on January 1st of the specific year when it was used first.