"A posthumous 1973 solo album from the Texas singer-songwriter, released the week he would've turned 75, displays his careful sense of craft across a set of covers, favorites, and unheard songs ... Much of Sky Blue's charm derives from how it doesn't quite slide into any particular category. It's neither a live album nor an album of its own, yet it's also not a set of demos for a forthcoming record. Instead, it's a vivid snapshot of a particular moment, preserving a time when he had yet to fritter away his good will, and capturing Townes Van Zandt when it still seemed like he was on the verge of great things".