The program will conclude with a nod to Whittier. The Amesbury Quaker was devoted to social causes and reform, and the text of Walker’s “The Tree of Peace” has been adapted from Whittier’s poem, “O Brother Man.”
IF YOU GO What: "Cantemus Turns 30" When: Saturday at 7:30 p.m. at Christ Church of Hamilton-Wenham, 149 Asbury St., Hamilton; Sunday at 4 p.m. at St. Paul's Church, 166 High St., Newburyport. How: Tickets are available online at http://www.mktix.com/ccc, or fans can save $2 on advance tickets purchased at The Book Rack in Newburyport. Tickets at the door are $20 for adults, $17 for seniors. Admission is free for students 21 and younger. For details, visit www.cantemus.org, or call 1-888-CHORUS 1.