Immaculate. The versions of “Astronomy Domine,” “Careful with That Axe, Eugene,” and “Set the Controls for the Heart of the Sun” are definitive. You hear the space between the notes. You hear the echo. This is the Floyd as a unit —meditative, powerful, and scary.

They would perfect this on Dark Side of the Moon . But in 1969, they proved they had the ambition . Grade: B+ (Essential for deep fans, confounding for casuals)

1969 is not the year you start with Pink Floyd. It’s the year you go to after Dark Side , Wish You Were Here , and The Wall have burned themselves into your soul. It is the awkward, brilliant, self-indulgent, and utterly necessary adolescence of a band learning that silence is as loud as a scream, and that a story can be told without a single verse-chorus.