september 8 (sold out) & 9

It’s pure coincidence – pure, total, utter coincidence – that Pink Floyd co-founder and main writer for most of its years, Roger Waters, is playing “The Dark Side of the Moon’’ at this point in time. This has been in the works for a long time, way before Syd Barrett, Floyd’s drug-and-brain damaged avatar checked out. (Syd checked out/was booted out of Floyd pretty much after the first album; they build a career, much of it, writing about his disintegration and madness. Irony: It abounds.)

Pink Floyd itself (sans Waters) played “Dark Side," much of it based on Syd, the last time we saw them at Foxborough Stadium. (Floyd, according to guitarist David Gilmour is over, following the brief reconciliation gig with Waters at the Live8 concert.) Songwriter-singer-bassist Waters – knowing that “Dark Side” is a masterstroke of an album and a sure-sell – has been playing the ultimate concept album as the second half of his current tour, where it began in Europe this spring. During the first half, he and his band have been playing songs from “The Wall,’’ “Wish You Were Here,’’ and the “The Final Cut,’’ among other records. Encores? Expect “Another Brick in the Wall (Part 2),” “Bring the Boys Back Home’’ and “Comfortably Numb.’’

Why do we keep coming back to Waters? He has a deep seething hatred for hypocrisy, sometimes manifested in a cutting mean streak. His “all and all, we’re all just bricks in the wall’’ summation may not be far from reality. Yet, he has buried a kernel of hope underneath the walls of pessimism. And he’s written killer melodies, layered the soft and the hard, mixed the sensitive and the bombastic. Show starts at 8 p.m. Tickets: $37-$132.

Tweeter Center, Rte. 140, Mansfield, 617-931-2000 livenation.com