Aquarius (Let the Sunshine In)

This medley is popularly known as "The Age of Aquarius" and was written for the 1967 musical Hair by James Rado and Gerome Ragni (lyrics), and Galt MacDermot (music), released as a single by The 5th Dimension (1969).  Though the sentiments are a pile of peace-love, astrological rubbish, it's a pretty cool song.  Just dig the music and the vocals and file 13 the lyrics.