Roger Waters’ relationship with The Wall, which begins a European stadium tour in July, has continued to change over the years — and, in no small way, because he’s presenting it without the other members of Pink Floyd.

The inspiration that led to Pink Floyd projects like Dark Side of the Moon, Wish You Were Here and The Wall has been endlessly dissected. People talk about modern isolation, departed bandmates, the scourge of war. Not quite.

In a newly unearthed talk, Pink Floyd co-founder Rick Wright offers fresh insights on Dark Side of the Moon during its 40th anniversary, and on the tangled relationships that eventually tore the group apart.

Roger Waters’ 2013 tour of The Wall through a series of outdoor venues in Europe promises even more outsized thrills for fans of one of Pink Floyd’s most recognizable albums — and the chance to hear something new, as well.

The phenomenal success of Roger Waters’ tours featuring The Dark Side of the Moon and The Wall, not to mention recent guest appearances by former bandmates Nick Mason and David Gilmour, beg the question: What about reuniting Pink Floyd?

Roger Waters has a different feeling about playing stadiums, several decades after presenting his original production of The Wall with Pink Floyd some 29 times in 1980.

Though he’s more recently shared the stage with both of Pink Floyd’s other surviving members, Roger Waters says a forthcoming solo project won’t include either David Gilmour or Nick Mason.

When excavating for deep cuts from Pink Floyd, you must first avoid Dark Side of the Moon which, after its decades-long run on the album charts, has a distinct air of been-there-done-that familiarity.

Nobody is going to accuse Pink Floyd — whether collectively, or apart — of inundating the market with product. The group has only issued three projects in the last 30 years, while its members have been just as stingy with solo albums.

Over the 30 years since its release, Pink Floyd’s The Wall has taken many forms — and it’s continued to evolve for principal author Roger Waters, as well.