In this task, you're given passages that contain mentions of names of people, places, or things. Some of these mentions refer to the same person, place, or thing. Your job is to write questions that evaluate one's understanding of such references. Good questions are expected to link pronouns (she, her, him, his, their, etc.) or other mentions to people, places, or things to which they may refer. Do not ask questions that can be answered correctly without understanding the paragraph or having multiple answers. Avoid questions that do not link phrases referring to the same entity. For each of your questions, the answer should be one or more phrases in the paragraph, and it should be unambiguous.
Q: Passage: On 10 June 1859, the 19-year-old Tchaikovsky graduated as a titular counselor, a low rung on the civil service ladder. Appointed to the Ministry of Justice, he became a junior assistant within six months and a senior assistant two months after that. He remained a senior assistant for the rest of his three-year civil service career.Meanwhile, the Russian Musical Society (RMS) was founded in 1859 by the Grand Duchess Elena Pavlovna (a German-born aunt of Tsar Alexander II) and her protégé, pianist and composer Anton Rubinstein. Previous tsars and the aristocracy had focused almost exclusively on importing European talent. The aim of the RMS was to fulfill Alexander II's wish to foster native talent. It hosted a regular season of public concerts (previously held only during the six weeks of Lent when the Imperial Theaters were closed) and provided basic professional training in music. In 1861, Tchaikovsky attended RMS classes in music theory taught by Nikolai Zaremba at the Mikhailovsky Palace (now the Russian Museum). These classes were a precursor to the Saint Petersburg Conservatory, which opened in 1862. Tchaikovsky enrolled at the Conservatory as part of its premiere class. He studied harmony and counterpoint with Zaremba and instrumentation and composition with Rubinstein.The Conservatory benefited Tchaikovsky in two ways. It transformed him into a musical professional, with tools to help him thrive as a composer, and the in-depth exposure to European principles and musical forms gave him a sense that his art was not exclusively Russian or Western. This mindset became important in Tchaikovsky's reconciliation of Russian and European influences in his compositional style. He believed and attempted to show that both these aspects were "intertwined and mutually dependent". His efforts became both an inspiration and a starting point for other Russian composers to build their own individual styles.
A:
What is the full, unabbreviated name of the institution that hosted a regular season of public concerts during the six weeks of Lent?