Tchaikovsky resubmitted the manuscript to Rubinstein and Zaremba during the Christmas break. Even with their insisted changes, they still disapproved of the symphony on the whole; however, this time they passed the adagio and scherzo as "being fit for performance". These two movements were played at an RMS concert in St Petersburg on February 23, 1867, with no success. Tchaikovsky, who had looked upon St Petersburg as the premier musical location in Russia and been obsessed with having his symphony performed there first, was thoroughly disillusioned — not only with St Petersburg audiences, but also with the critical judgments of both his former teachers. He discarded all the revisions they had demanded, standing with one exception by his original version. The exception, it turned out, was unavoidable. At Zaremba's insistence, he had composed a new second subject for the opening movement. He had discarded the papers that contained his original second subject, and he could not remember what he had originally composed. Tchaikovsky had to let the second subject as approved by Zaremba stand as it was.