Pianist Arnold Ostroff has been a member of the Delaware County Symphony for nearly forty years. He has appeared as featured soloist on sixteen occasions performing piano concertos by Beethoven, Brahms, Saint-Saëns, Tchaikovsky, Mendelssohn, and Prokofiev. He has also participated in numerous chamber series programs as either a soloist or as part of a musical ensemble. When not appearing on stage as a pianist, he can be seen in the percussion section, usually playing cymbals or the electronic keyboard.

In his youth, Mr. Ostroff studied piano with Clement Petrillo at the Philadelphia Musical Academy. At age sixteen he was a winner of the Junior Student Auditions and performed with the Philadelphia Orchestra at the Academy of Music. He also appeared on local television and performed concertos with the Lansdown Symphony Orchestra, the Marple Newtown String Ensemble, Philadelphia Musical Academy Orchestra, and the Garden State Philharmonic. In the following years, he was a finalist at an international competition in Chicago sponsored by the Artists’ Advisory Council, and gave performances at the Philadelphia Museum of Art and the Philadelphia Civic Center.

Mr. Ostroff has degrees in electrical engineering from Drexel University and the University of Pennsylvania. In 2010 he retired from the U.S. Navy after forty-five years of civilian service. His last position was as Director of Strategic Planning for the Carderock Division of the Naval Surface Warfare Center. Mr. Ostroff has served as DCS board president, written grant applications for the orchestra, and currently maintains the DCS website and several archival databases. His non-musical interests include photography and puzzle-solving. He is a long-time resident of Springfield, Delaware County, and lives with his wife Barbara, the principal violist of the Delaware County Symphony.


Narrator Michael Bolton has been with Opera Philadelphia since 2001. After overseeing the company’s education, community, and inclusion initiatives for fourteen years, he recently changed positions and is now the Individual & Planned Gift Officer.

During his time with Opera Philadelphia, Mr. Bolton created and developed several programs which bring art and opportunity to Philadelphia’s youth: the free all-city youth choir Teen Voices of the City Ensemble (T-VOCE), the technical theater workforce-readiness program Backstage Pass, and Sounds of Learning, an in-school arts integration program.

His community programming was the winner of OPERA America’s first ever Diversity Award in 2006. Videos of his acclaimed series of Random Acts of Culture pop-up performances, funded by the John S. and James L. Knight Foundation, have been viewed over 12 million times on YouTube™. Within that series, the “Hallelujah” chorus at Macy’s in Philadelphia has over 9 million views.

Mr. Bolton has lectured for Metropolitan Opera Guild, The Philadelphia Orchestra, the Curtis Institute of Music, University of Pennsylvania, Cheyney University, American Association of University Women, among many others.  He has curated opera programming at African American Museum of Philadelphia, Annenberg Center for the Performing Arts, The Barnes Foundation, National Museum of American Jewish History, Pennsylvania Academy of the Fine Arts, and the University of Pennsylvania Museum of Anthropology and Archaeology, to name just a few.

Mr. Bolton also is a freelance voiceover artist and shares his love of music as a Classical Host every Saturday morning on WRTI 90.1 FM.


Violinist Nina Vieru has performed on many of the most prominent stages in Romania, Moldova, Serbia, Mexico and the United States including Carnegie Hall, Alice Tully Hall, Verizon Hall and Perelman Hall. She was a guest soloist with the Galati Philharmonic Orchestra, the Brasov Philharmonic Orchestra, and has twice appeared in concert at the George Enescu Festival in Bucharest. Ms. Vieru has successfully participated in more than 35 national and international violin competitions. In 2011, she won the Temple University Concerto Competition and the LISMA Foundation International Music Competition (New York City). She performed during the Endless Mountains Music Festival in Wellsboro Pennsylvania and Gretna Music Festival, both in 2015-2016.

Ms. Vieru was born in Chisinau, Republic of Moldova, to a family of musicians. At the age of seven, she began her study of the violin at the Music High School in Chisinau. Six years later, her family moved to Bucharest, Romania’s capital, where she studied with noted violinist Stefan Gheorghiu. After graduation in 2007, Nina moved to the United States and studied violin with Edouard Schmieder at Temple University. She earned both her bachelor’s and master's degrees at Temple, and in 2021 completed her doctor's degree in music there.


Nina is a member of numerous orchestras, including Symphony in C, Bay Atlantic Symphony, Lancaster Symphony, New Jersey Capital Philharmonic Orchestra, New Brunswick Chamber Orchestra, Philadelphia Virtuosi Chamber Orchestra, Pennsylvania Philharmonic, and the Samuel Barber String Quartet. In 2017, she led the Temple University Symphony Orchestra in performances at the Kimmel Center and Lincoln Center. Nina is entering her seventh year as the Delaware County Symphony’s concertmaster.


Ms. Vieru enjoys life together with her husband Rayd and their children Sarah and Leo.