GALESBURG, ILLINOIS (April 27, 2023) — The 2023 Carl Sandburg Songbag Concert Series continues Sunday, May 14, with singer, songwriter and guitarist Nathan Cowan performing at the Carl Sandburg State Historic Site in Galesburg.Formerly of Harvest Sons and The Dirty Loew, Cowan recently embarked on a solo career. His set will feature original songs along with tunes by other