Benjamin Britten's "Ceremony of Carols" is filled with images of nature. Though it's most often performed at Christmas, one movement, "A Spring Carol," opens with these lines:
"Pleasure it is to hear, iwis,
The birdes sing…"
The text comes from a medieval carol celebrating renewal. And Britten leans into that spirit — intentionally writing a joyful duet that echoes something we hear every spring: male birds singing back and forth, as if in conversation.
For centuries, people assumed birds were singing simply for joy. Science suggests something more specific.
In most species, it's the males who sing — and primarily during the breeding season. Both males and females make calls year-round. Those calls carry everyday messages: warnings, location, contact.
Song is something else.
A bird's song is a signal. It says, "This is my territory," or "I'm a strong, healthy mate." It's less poetry — and more advertisement.
And there's an even more surprising twist. In spring, songbirds are not just more inclined to sing — they’re compelled.
As daylight increases, hormones surge. In male songbirds, the parts of the brain that control song actually expand — then shrink later in the year. This seasonal reshaping is one of the clearest examples of brain plasticity in the animal world.
So those beautiful spring melodies aren't expressions of joy. They're messages — urgent, instinctive and purposeful. "Choose me," they say. Or, just as clearly, "Stay away from my territory."
Still, Britten’s music captures something true. The days lengthen. The air shifts. The migrants return.
And soon, it will be a pleasure to hear the birdes sing. Our brains may not be reshaped by the season — but our hearts will swell.
