Russian cellist and music teacher (b. 1850), born Sergey Yakovlevich Morozov (Сергей Яковлевич Морозов).
In the early 1880s Morozov made an arrangement of Tchaikovsky's song The Fearful Minute — No. 6 of the Six Romances, Op. 28 — for cello and piano, which the composer regarded highly.
Correspondence with Tchaikovsky
2 letters from the composer to Sergey Morozov have survived, dating from 1882, both of which have been translated into English on this website:
2 letters from Morozov to the composer, dating from around 1882, are preserved in the Klin House-Museum Archive.