: Maintaining a clear, powerful song throughout the judging period.
: Avoiding the "contamination" of songs from other bird species, which can happen if the bird isn't carefully shielded during its learning phase. Ivana Mladenović: A Legacy of Excellence pesma_stiglica_002_2017_ivana_mladenovic_world_...
: The bird must perform a series of distinct melodic phrases without harsh or incorrect notes. : Maintaining a clear, powerful song throughout the