While Kurt Wagner’s role as bandleader in seminal soul/country/folk collective Lambchop sees him deal in multiple shades of deep-orange warmth, Cortney Tidwell’s solo career is often shaded by a kind of icy detachment; an engaging, beautiful coldness. At first glance they might not seem the most natural fit for an album of country takes from the 60s and 70s, but look a little deeper and Invariable Heartache makes perfect sense.