The Real Ghostbusters Intro
Found by YouTube user DirRudy, here's a high quality version of the intro for seasons 1-3.
Ghostbusters! If there's something strange In your neighborhood, Who you gonna call? Ghostbusters! If there's something weird, And it don't look good, Who you gonna call? Ghostbusters! I ain't 'fraid of no ghost! I ain't 'fraid of no ghost! Who you gonna call? Ghostbusters! Who you gonna call? Ghostbusters!