Calgary Principal Horn

It is probably not a common thing to see, though in most cases it is usually because they have won another position. There could be a variety of other reasons, depending on the situation a candidate is coming from, like if the person is currently holding another position. Not necessarily specific to this situation but just some possibile reasons: Maybe a winning candidate could not negotiate the salary they had hoped and it was a deal-breaker for them, or possibly a winning candidate did not end up liking the city, or the orchestra etc.. after completing their trial.