How 'Let There Be More Light' Used Sci-Fi and a Bass Riff to Move Pink Floyd Beyond Syd Barrett

The opening bassline of A Saucerful of Secrets is the first real sign that Pink Floyd had a future without Syd Barrett. Roger Waters locked into a driving, repetitive blues riff—simple but insistent, nothing like the wandering psychedelia of the Barrett era. It was Waters’ first major songwriting contribution, and it announced that the band was now willing to build songs around a groove rather than a trip.

The lyrics play with sci-fi imagery: “Remember a dog … Remember a signal … The universe is a big place.” The title itself twists the Biblical “Let there be light” into something about expansion and discovery—more light, not a single flash. Given the album’s context, it can also read as a quiet boast: we’re still here, and we’re going deeper. The song never spells out a narrative, but the feeling of a signal being sent into space, of a new direction being broadcast, is unmistakable. It’s the sound of a band finding its footing by looking outward instead of inward.