Barrett: The Definitive Visual Companion, previously available only in a lavish deluxe edition, will get a wide paperback release this fall
Singer and guitarist revisited "Octopus" and "Dominoes," two tracks he had co-produced for Barrett in 1970
Limited edition vinyl will come out via group's Pink Floyd Records
"I realize now how young and immature we were and how hopeless we were at coming to grips with Syd’s breakdown," drummer says
Drummer reflects on group's path to 'Dark Side of the Moon,' chronicled in exhaustive new box set
What to look for among new set's 27 discs of mostly previously unreleased performances charting group's formative period
Watch David Gilmour, Nick Mason and Rick Wright (in his final performance) play "Arnold Layne" in 2007
Collection will include many previously unreleased recordings and films of the band
From a song about an underwear thief to an unreleased art-history tome, read fascinating facts about the doomed genius
Six songs recorded prior to 'The Piper at the Gates of Dawn' appear on limited edition set of seven-inch singles
