Now that Brent Cobb has earned respect as an in-demand songwriter for Nashville stars, the Georgia native is introducing his own brand of easygoing, sun-baked country soul. “Solving Problems” and “The World” envision a low-key jam session between James Taylor, Dickey Betts, and Ray Lamontagne. Cobb replaces the righteous swagger of Southern rock with something gentler, sweeter, and more searching.