Cincinnati’s Messerly & Ewing is the 17-year-old songwriting partnership of musicians Mark Messerly and Brian Ewing, whose catalog has been remarkably consistent from the start. But that doesn’t mean that the duo hasn’t progressed and evolved over the years. Every Bitter Thing finds the twosome in peak form, featuring some of the best songwriting in their decades-crossing career. Perhaps it’s the comfort of their creative brotherhood — both stay busy with other projects, particularly Messerly, who plays bass (and many other instruments) with Wussy. Or maybe it’s the growth of Messerly & Ewing into a cohesive band unit; on Every Bitter Thing, bassist Sean Rhiney and drummer Bill Donabedian find a tasteful groove behind the duo’s well-crafted, highly melodic sound and contribute greatly to it.