The season will conclude with ProMusica Arizona’s “20th Anniversary Celebration” featuring the world-premiere of Saguaro Song by Arizona composer Craig Bohmler, well-known for Arizona Opera’s “Riders of the Purple Sage.” Saguaro Song is a suite of five songs for choir and orchestra with texts by award-winning Canadian author Marion Adler who uses the iconic saguaro cactus as a metaphor for the seasons of life. In addition, ProMusica Arizona will present A World Without Boundaries by Timothy Powell with texts by American astronauts. The piece was commissioned for ProMusica Arizona’s 15th anniversary season. Morten Lauridsen’s Sure on the Shining Night, Ola Gjielo’s Sunrise (Gloria) from “Sunrise Mass,” and other musical gems will be featured to round out the festivities. Performances will be held on Saturday, April 1 at 7:00 pm at All Saints Lutheran Church in North Phoenix and Sunday, April 2 at 3:30 pm at American Lutheran Church in Sun City.