he became even more interested in opera after karl muck had conducted richard wagner’s ring cycle four times in st petersburg, but wagner’s music did not influence his own style. however, he also had lots of worries, particularly about the health of some members of his family. he started to become depressed and worried about losing his ability to compose. he became more relaxed after he moved to a new home in the country. he composed the operas "christmas eve" and "sadko". he wrote many beautiful songs and made changes to some of his earlier music. he also wrote an autobiography.