The vocalizations of the pied butcherbird (Cracticus nigrogularis) include calls (e.g., food begging [above], alarms, cat scolding), calls incorporated into songs, and pure songs. The latter category may include melismas, ostinatos, transpositions, inversions, variations, and rhythmic effects such as additive and divisive patterns.
Cultural manifestations include duets, antiphonal and canonic effects, and unisons. They also mimic other birds and unexpected sources such as dogs, cats, humans, and machines.
This according to “Decoding the song of the pied butcherbird: An initial survey” by Hollis Taylor (TRANS: Revista transcultural de música/Transcultural music review XII [July 2008]). Below, a pied butcherbird duet followed by a solo.