Song of the Dryads

• WWizards of the Coast2014-11-07
  Official Ruling
  If the permanent was an Aura or an Equipment, it becomes unattached from whatever it was attached to.
• WWizards of the Coast2014-11-07
  Official Ruling
  The enchanted permanent loses any card types, subtypes, and colors it previously had. It keeps any supertypes it had and its name remains unchanged. It gains “: Add ” and loses all other abilities from its rules text. It will still have any abilities it gained from other effects.

Rulings via Scryfall