Post-rock shares more with prog rock than six letters. Both are rock music that doesn’t want to rock, be rock and are beyond quotidian rock. Of course, these labels are never self-defined. But post-rock is what Austin Texas’s Explosions in the Sky are lumped in with. Unlike prog rock, it’s not about flash technique. A guitars-and-drums four-piece, their instrumental music is about texture, rather than melody or verse-chorus-break structures. Sixth album Take Care Take Care Take Care doesn’t take them to new places though. It restates who and what they are.