premise: An orchestra of about 30 people are practicing on the stage of what appears to be an auditorium full of green chairs. hypothesis: The Rochester, NY Philharmonic practicing before opening night of their 2014 orchestral season.
neutral: There are many orchestras other than The Rochester NY Philharmonic.  Practicing does not happen exclusively before opening night.  Practicing does not imply any sort of timestamp that would pinpont the 2014 orchestral season.