"Zodiac" had an amazing soundtrack

The opening to "Zodiac" was absolutely brilliant.
The audience sees the evening views of San Francisco set to Three Dog Night's "Easy to be Hard":



Donovan's haunting voice in "Hurdy Gurdy Man" and the psychedelic melody really complemented the chilling scene and uncertainty in the "Zodiac.


If after hearing this song, you were as curious about the meaning as I was then check out this website.

Pay special attention to 'jonchapple' and 'flipFLOPpitaj's comments (Obviously, I didn't know how to correctly punctuate the user names, indicating proper nouns and possessive qualities...correct me in a comment if you know the correct punctuation).