 The OSO has a different repertoire from the National Arts Centre Orchestra.The OSO is a larger orchestra than the NACO, which allows the OSO to perform works for large orchestra that would not be possible for the NACO.According to The Canadian Encyclopedia, "The Ottawa Symphony Orchestra has co-existed gracefully with the NACO, playing in the same magnificent auditorium (the Opera of the NAC) and planning its program to complement the more complex fare of the full-time orchestra."