Crosby, Stills and Nash

“Teach your children well. Their father’s hell did slowly go by,” Graham Nash wrote in his pacifying 1970 lyrical anti-war anthem, “Teach Your Children.” Little did he know how prescient he would be that “their children’s hell will slowly go by.” Nor did he realize that he would still be around to sing it to them in three-part harmony. Yet the folksy troubadour trio is still strumming away to the plangent “Guinevere,” “Helplessly Hoping,” and the kaleidoscopic “Suite: Judy Blue Eyes,” albeit with slightly receding hairlines, though the hirsute Crosby looks more like Gimli from Lord of the Rings than ever.

Tue., July 8, 8 p.m.; Wed., July 9, 8 p.m.; Fri., July 11, 8 p.m., 2014