Framed by saguaros, the beige symmetrical crest of Mount Ajo rises above a clay-colored 800-foot vertical wall of welded rock. On a stone block staircase, descend into Estes Canyon and cross the wash.

A decommissioned pipe organ has been given a second life by Mount Auburn Cemetery artist-in-residence Eden Rayz. She premieres a new work in Bigelow Chapel on Saturday.