What makes Trances/Drones by Robert Rich notable?

'Trances/Drones' has been influential in the ambient genre, particularly for its innovative use of long-form tracks that invite introspection. The album is noted for helping to define the sound of 'sleep concerts,' where Rich performed live sets designed to induce deep relaxation and consciousness exploration. When 'Trances/Drones' was released in 1994, Robert Rich was already established in the ambient music scene following his previous album 'Geometry' (1991). This album marked a period of further experimentation for Rich, as he sought to deepen the listener's experience through extended compositions that emphasized meditative qualities and immersive sound environments.