In November 1887, Tchaikovsky arrived in Saint Petersburg in time to hear several of the Russian Symphony Concerts, one of which included the first complete performance of the final version of his First Symphony and another the premiere of the revised version of Rimsky-Korsakov's Third Symphony [REF].
A side benefit of Tchaikovsky's friendship with Glazunov, Lyadov and Rimsky-Korsakov was an increased confidence in his own abilities as a composer, along with a willingness to let his musical works stand alongside those of his contemporaries.