A bardinal is a cardinal-like bird that is adpet with music [hence the bard play on words] the type of music it commands and it's element depend on color. It also presides over Tunebirds.
A group of Bardinals with Tunebirds and/or Kaetievyz Birds is called a feather.
Red: horn/fire
Green: drum/nature
Blue: violin/water
Black: guitar/dark
White: steam sounds and similiar effects/ice
Purple: harp/flute/psychic
Gray: piano/illusion/ghost
Feathers with Bardinals in them:
Treidyv
Highwing
Flamefeathers [Bardinal only]