Some of Texas’ best-known songwriters assembled at the Hard Rock Cafe last night as part of the Tin Pan South songwriters festival. Gary Nicholson, Leroy Parnell, Bruce “Hey Baby” Channel and Michael Martin Murphey shared the stage. They’re clearly old friends and build off each other’s performances. Murphy was the biggest name, underscoring that by playing his two biggest singles right out of the box: “Carolina in the Pines” and “Wildfire.” The four performers had as good a time as the audience.