The deep and true cosmic Americana of Birdie Busch is something of a rarity in these parts — rarely do you have someone who's very much rooted in a city like Philly whose music evokes both this place and points far, far west. Busch's new one, Thunder Bridge, expands that range into a whole other direction, so that now she's playing across spaces both physical and temporal. Thunder Bridge was written for a friend who was expecting, see, and it's a kind of intergenerational lullaby. Along the way, there's Busch's ever-present good spirit, with backing that calls to mind M. Ward, another warm soul whose work sits at these kinds of crossroads, too. The Boot & Saddle's a perfect venue in a few different ways to take all this in, too — it is, after all, a cowboy bar on South Broad. Just like all of Birdie's records.