Birdsong explores the dying whistling traditions of the Hmong people of northern Laos, whose sonic exchanges straddle the boundary between music and speech. The film follows the personal stories of three individuals from Long Lan village, as they reflect on their experience as practitioners of a vanishing musical language.

Birdsong portrays the collision of an ancient linguistic practice with the modern condition of urban life in Laos. The film explores how listening can change our perception of both society and nature, offering a glimpse into the philosophical relationship between sound and reality.