BRUNSWICK — The Oratorio Chorale, under the direction of Peter Frewen, will present “OperaTics,” high passion and vocal dazzle from the world of opera.

Performances will be at 7:30 p.m. Saturday, Feb.27, at the Coleman-Burke Gallery and at 3 p.m. Sunday, Feb. 28, at the Franco-American Heritage Center in Lewiston.

Featured soloists, who are donating their services, are sopranos Christina Astrachan and Danielle Vayenas; tenors Douglas Barley and Timothy Neill Johnson; and bass-baritone John D. Adams.

Frewen said he built the program around complete scenes from celebrated operas, including two by Verdi, “Aida” and “La Traviata;” and two by Mozart, “Idomeneo” and “Abduction from the Seraglio.” In addition, soloists and chorus will present scenes from Puccini’s “La Bohème;” “Samson et Dalila” by Saint-Saëns; “Fidelio” by Beethoven; and Gounod’s “Faust.” The program is rounded out by several choruses and airs by Verdi, Puccini, Mozart, Massenet and Sullivan.

Mary Hunter, professor of music at Bowdoin College, will offer backstage commentary on scenes, ensembles and choruses. Michal Harris of the University of Southern Maine is accompanist for the concert.

Astrachan performs with the Portland Symphony Orchestra, Oratorio Chorale, Maine Music Society, DaPonte String Quartet and the Boston Early Music Festival. She premiered Tom Myron’s “Kaethe Kollwitz,” a work written for her and the PSO.

Vayenas has sung with PORT Opera for several years and has been a featured soloist with the Oratorio Chorale, Maine Music Society, Choral Art Society, Midcoast Symphony Orchestra, Boston Masterworks Chorale and the Paul Madore Chorale.

Barley is director of the Unitarian Universalist Community Church choir in Augusta. He has performed roles in opera and musical theater in Indiana, the Carolinas, New York and Maine. Last year, he was a featured soloist with the Oratorio Chorale.

Johnson performs with musical ensembles, including the Roger Wagner Chorale, Boston Cecelia, Handel Societies of Dartmouth and Baltimore, PSO and Oratorio Chorale.

Adams performs in opera, musical theater, concert and recitals. He has appeared with PORT Opera, Opera Boston and Longwood Opera; and in concert with the San Francisco Symphony, Berkeley Symphony, North Shore Philharmonic, Masterworks Chorale, Oratorio Chorale and Chorus Pro Musica.

Hunter is the A. LeRoy Greason Professor of Music at Bowdoin College. She has authored many works on 18th century music and opera, including “Mozart’s Operas: A Companion and The Culture of Opera Buffa in Mozart’s Vienna,” which won the American Musicological Society’s Kinkeldey prize.

The Coleman-Burke Gallery is next to the Frontier cafe in Fort Andross. Saturday concertgoers may purchase dinner or light refreshments at the cafe before the performance and during intermission. Patrons on Sunday may show their tickets to receive a discount for Sunday brunch at Fish Bones American Grill, 70 Lincoln St., Lewiston, near the Franco center. To make reservations for the 1:30 p.m. brunch seating, call 333-3663.

Admission is $20 in advance, $25 at the door for the Brunswick concert. Tickets for the Lewiston concert are $21 in advance, $26 at the door, and include $1 to support the historic Franco center. Advance tickets for the Lewiston concert may be purchased at L/A Arts on Lisbon Street, Lewiston; or by calling 782-7228.

Tickets for the Brunswick concert are available at the Frontier Cafe in Fort Andross and Gulf of Maine Books in Brunswick; at Now You’re Cooking and Magnolia’s in Bath; at Sherman’s Books and Stationery in Freeport; at Treats in Wiscasset; at Clayton’s in Yarmouth; and at Starbird Music and Longfellow Books in Portland.

For more information, call 725-1420 or visit www.oratoriochorale.org.