The Trees Community was a communal musical project based out of the Cathedral of Saint John the Divine in New York City. The group were a religious order of sorts in that community, splitting their time between performing music, giving tours of the church, among other duties. A key feature of their work was the use of an array of instruments from around the world including the sitar, tamboura, and Venezuelan harp accompanying complicated vocal arrangements.
According to their website they began meeting in an abandoned loft in New York’s East Village to share meals and discuss all manner of spiritual matters, eventually incorporating music into their spiritual practice. When the building was set to be demolished, they–in true hippie fashion–purchased a bus and began living communally within and performing across the country. A member of the group has written a book documenting their experiences that you can read here. A few years after leaving NYC, they recorded an album called The Christ Tree, which was the only official release that the group ever put out. In 2006, Hand/Eye released The Christ Tree on CD for the first time. This box set contained all extant material recorded by the group, including live performances and a cassette released by the group called Portrait of Jesus Christ in Music. It looks like Discogs is your best bet to track down the release, although digital files can be found on CDBaby if that’s your bag.