The main theme (Swan Theme) from the ballet Le Lac des cygnes (Swan Lake) was composed in 1875–1876 by Pyotr Tchaikovsky and is one of the most famous melodies in classical music. It appears primarily in the scenes featuring the swan motif and conveys a gentle, melancholic atmosphere, highlighting the central theme of transformation and the longing of Princess Odette.
I have arranged the piece in six different versions for piano: Versions 1–3 are in A minor, and Versions 4–6 are in B minor (original key).