Solution

Each sentence in the document refers to song lyrics, but has some words replaced with synonyms. For instance, "Never made it as a knowledgeable male." would actually be "Never made it as a wise man" which is from the song "How you remind me" by Nickleback. By taking the release year of each song and comparing it to the year in the header of the document, you get a set of numbers. One translated into letters, the password gunplay is obtained.