Which Stevie Wonder album was recorded as the soundtrack to a 1979 documentary film?

Journey through the Secret Life of Plants was recorded as the soundtrack to a 1979 documentary film.

The album was inspired by the documentary The Secret Life of Plants, directed by Walon Green and based on the book by Peter Tompkins and Christopher Bird. Wonder created an ambitious double album that used synthesizers, vocals, orchestration, and environmental themes to respond to the film’s subject.

Released in 1979, it followed Songs in the Key of Life and represented a major change in mood and format. Rather than centering on a conventional set of pop singles, the project was conceived as a sprawling soundtrack and concept work.

The album is sometimes confused with The Woman in Red, another soundtrack project by Wonder. The Woman in Red arrived in 1984 and contained “I Just Called to Say I Love You,” whereas Journey through the Secret Life of Plants belongs to his late-1970s period.