Substitution Cipher Puzzle

These lyrics are from the song "Woodstock" written by Joni Mitchell in 1969, inspired by the legendary Woodstock Music and Art Fair held in Bethel, New York. Ironically, Mitchell herself did not attend the festival — her manager advised her to appear on The Dick Cavett Show instead — and she wrote the song based on accounts from her then-boyfriend Graham Nash and other friends (Review) who were there.

The line "we are stardust" is both poetic and scientifically accurate. The heavier elements that make up our bodies were forged in the nuclear furnaces of ancient stars that exploded as supernovae billions of years ago. Mitchell's lyrics captured the spiritual idealism of the counterculture movement while inadvertently expressing a profound astrophysical truth that Carl Sagan would later popularize: we are, quite literally, made of star stuff.