Silent tree activity, like photosynthesis and the absorption and evaporation of water, produces a small voltage in the leaves. In a bid to encourage people to think more carefully about their local tree canopy, sound designer and musician Skooby Laposky has found a way to convert that tree activity into music.

By connecting a solar-powered sensor to the leaves of three local trees in Cambridge, Massachusetts, Laposky was able to measure the micro voltage of all that invisible tree activity, assign a key and note range to the changes in that electric activity, and essentially turn the tree’s everyday biological processes into an ethereal piece of ambient music.

You can check out the tree music yourself by listening to the Hidden Life Radio—Laposky’s art project—which aims to increase awareness of trees in Cambridge, Massachusetts, and the city’s disappearing canopy by creating a musical “voice” for the trees.

The project features the musical sounds of three Cambridge trees: a honey locust, a red oak, and an 80-year-old copper beech tree, all located outside the Cambridge Public Library. Each tree has a solar-powered biodata sonification kit installed on one of its branches that measures the tree’s hidden activities and translates it into music.

According to WBUR, between 2009 and 2014, Cambridge was losing about 16.4 acres of canopy annually, which is a huge loss considering that tree canopies are crucial to cities, cooling them down during the summer, reducing air pollution, sucking up carbon, and providing mental health benefits.

Laposky hopes that people will tune into Hidden Life Radio and spend time listening to the trees whose music occurs in real-time and is affected by the weather. Some days they might be silent, especially when it hasn’t rained for several days and they’re dehydrated. The project will end in November, when the leaves will drop — a “natural cycle for the project to end,” Laposky says, “when there aren’t any leaves to connect to anymore.”