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The UNSC Symphony Orchestra (or UNSCSO for short) is a instrument ensemble/group of over 100 members. All members are presumably part of the UNSC Defense Force [1].
In 2556, they performed a piece of music in the UNSC Symphony Hall as a tribute to Master Chief Petty Officer John-117's heroism during the Second Battle of Earth and on the Ark. Otherwise, very little is known about the symphony orchestra.