It’s the males, of course, providing the music (females make alarm calls and other vocalizations but almost never songs). And while a male will sing for several reasons, the main function of a song is to inform other birds of the singer’s existence.
Specifically, a song informs rival males and potential mates of the bird’s species, and subtle variations to the song identify the bird as an individual. These variations are usually imperceptible to humans, but studies have shown that birds respond differently to the songs of their neighbors than to recordings of birds from other areas.
Studies have also shown that female birds respond more favorably to complex songs— Read the entire article.
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