Rachmaninoff's Sonata in G minor for Cello and Piano, Op. 19, 3rd movement.
I remember hearing this movement played in one of the practice rooms of my school and immediately gushing over its overwhelming melancholic beauty. I couldn't muster the courage to ask what piece it was but I was fairly certain it was Rachmaninov and sure enough he had a cello sonata which I hadn't heard of yet.
The opening introductory bars in the piano must be some of the most interesting in the repertoire, perhaps rather similar to Chopin's Op27 no1 in terms of chromaticism, as the chords seem to fluctuate between Eb minor and major but as you'll see, the F sharp simply acts as an appoggiatura.
Another interesting comparison would be Bruckner's 8th Adagio where he does something similar going from Db major to minor but that's just a side thought.

Recording (Yo-Yo Ma, Ax): [ Ссылка ]

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