Not songs, but my favorite two short and rather grownup Shel poems.

   In that dark cave,
   A lonely, burnt-out dragon sits
   And sighs
   And sadly sniffs
   The bone-filled suit of armor
   That lies rusting at his door.

   Please tell me just the fabuli,
   The miraculi, the gargantua,
   And kindly, kindly spare me
   All this insignificantia.