The Nassau & Suffolk Concert Orchestras are open to string, wind, brass and percussion students who have successfully performed a NYSSMA Level 5 or 6 solo. The recent Nassau orchestra averages between 90 and 100 players, depending on the year, and ranges in age from Middle School through High School seniors. The new Suffolk Concert Orchestra is fashioned after this model. 

The ensembles rehearse and performs primarily standard (and original) symphonic repertoire.

Recent major repertoire by the MYO Concert Orchestra has included:
Mussorgsky - Night on Bald Mountain
Copland - Saturday Night Waltz & Hoedown from Rodeo
Grainger - Molly On the Shore
Schubert - Symphony No. 8 “The Unfinished”
Borodin - Symphony No. 2
Washburn - St. Lawrence Overture, New England Holiday
Gould - American Salute
Gounod - Ballet Music from Faust
Sibelius - Finlandia
Handel - Music For the Royal Fireworks
Dvorak - Finale from Symphony No. 9 From the New World
Strauss - Trisch Trasch Polka
Bizet - Carmen Suite
Bizet - L’Arlessienne Suite No. 2
Offenbach - Ballet Parisienne
Von Suppe - Light Calvary Overture