The Most Heavenly Piano Music?

Mozart’s Theme from his A Major Sonata, K. 331, and Beethoven’s Adagio from the Sonata “Pathetique,” Op. 13, for me, have two of the most hauntingly beautiful melodies in the piano literature.

In particular, Mozart’s opening theme that threads through the composer’s innovative first movement in Variation form, is a lilting lullaby, played in TWO, though written in 6/8 meter.

In the video below, I try as best as I can, with my compromised piano, to flesh out a pervasive binary flow of notes that pulls the listener into a region of beauty that is sustained through six variations. (I will separately feature and explore)

But first the memorable opening:

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What is your favorite theme from the vast array of piano masterworks?