Tatiana Variation's Music is Adjusted from One of Tchaikovsky Piano Lovely Small Piece

Tchaikovsky wrote music for Eugene Onegin opera. But the Onegin ballet’s music is adapted from various other Tchaikovsky pieces (Breakdown of Eugene Onegin’s Different Versions)

One of the ballet’s highlight, the Tatiana solo in Act II. It is melodic, expressive, and perhaps the most heartbreakingly vulnerable part of the whole story. When Tatiana fall in love with Onegin, at Tatiana’s birthday Onegin danced and flirt with Tatiana’s sister and leaves Tatiana hurt in the crowd:

I stumbled across the OG music while listening through Tchaikovsky’s piano bagatelles:

Sounds any familiar?