This weekend marks the fourth annual Flower Piano festival in San Francisco. The Flower Piano festival is a partnership between the San Francisco Botanical Gardens and Sunset Piano.

For 12 days, a dozen pianos are scattered around the park. There are baby grand pianos tucked underneath willow trees, stand-up pianos out in the meadow. And throughout the garden, tendrils of music seem to waft through the air.

Brendan Lange is the Director of Visitor Experience and Marketing at the San Francisco Botanical Gardens. He says that Flower Piano can be a kind of “side door” into the garden.

“Maybe not everyone is so into plants,” says Lange, “but when you add a different element, you add music, it adds a different way for people to visit the garden.