Fifty years ago, Pink Floyd created an album that never saw the light of day. Now, an 81-year-old band member revisits that unreleased project, suggesting it might have changed the trajectory of modern music.

After nearly six decades, the true story behind the Beach Boys’ classic “Sloop John B” is finally coming to light, intriguing fans old and new. Despite its enduring popularity since 1961, the song’s meaning has remained a mystery—until now.