dithyramb

noun3

1. •
   A raucous and ardent choral hymn sung in ancient Athens in honor of the god Dionysus.
2. •
   A poem or oration in the same style.

   • While those who drown a truth’s empiric part In dithyramb or dogma turn frenetic; — Than whom no writer could be less poetic He left this lesson for all verse, all art. — 1969
3. •
   An impassioned speech; a rant.