The Concord Chorus, under the direction of Dr. Kevin Leong, presents Joseph Haydn’s “Maria Theresa Mass” on May 20, 8 p.m., at the spacious St. Camillus Church, 1185 Concord Turnpike, Arlington. This soaring and lyrical work for chorus, solo quartet, and orchestra, composed in 1799, is the fourth of Haydn’s six monumental Late Masses. From the work’s stately opening to its gentle close, Haydn infused his “Maria Theresa Mass” with exceptional warmth and great power. Dr. Leong: “To be sure, the Theresienmesse is also a work of great contrast and power, and it is unfortunate that it has been historically