Article snapshot taken from Wikipedia with creative commons attribution-sharealike license.
Give it a read and then ask your questions in the chat.
We can research this topic together.
The Nursery (Russian: Детская, Detskaya, literally Children's ) is a song cycle by Modest Mussorgsky set to his own lyrics, composed between 1868 and 1872.
The cycle was published in two series. Only the first two songs survive of the second series.
A child begs the nurse to tell a story, first about the awful bogey-man who carries naughty children into the forest and devours them, and later about a fairy-tale Tsar and Tsaritsa who live in a rich palace by the sea.
The two surviving songs of Series 2 (Russian: «На Даче», Na Dache, At the Dacha) along with a new edition of the five songs of Series 1, were published by V. Bessel and Co. in 1908.