This is bird note.

When two or more people sing together, they can create harmony by producing different notes at the same time.

Astonishingly, many songbirds can create harmony without another bird to back them up, all on their own.

That's thanks to the amazing vocal organ found in most birds, the syrinx. Unlike human vocal

chords, with just one passageway for air to travel through and create sound, a bird's

searinges has two passageways. It's located where the airways of the lungs meet. Different sets of

muscles and nerves control the two sides of the syrinx. That lets some songbirds, like this

Viri, sing two separate melodies at the same time.

At one point in the song, one melody rises while the other descends.

It's as if the bird has two voices.

While most people can only dream of sounding like a viri, throat singing practiced by the

Tuven people of Central Asia comes close.

Throat singers produce just one melodic line, but with multiple harmonic tones at once.

To sing two different melodies at the same time, humans just have to work together.

For Bird Note, I'm Ariana Rimmel.