“In 1841, at the height of his mastery, Mendelssohn wrote three variation cycles for piano in quick succession,” (Long + McQuade). “The first of them, the ‘Variations Serieuses’ Op. 54, should probably be regarded as his most important piano work. It formed part of an anthology of works by renowned composers of the time, proceeds from the sales of which were intended for the erection of a monument in Bonn” for Mendelsossohn’s German colleague, Beethoven.
“At that time there was something of a production line of so-called “Variations Brillantes” for piano; Mendelssohn gave his seventeen Variations in D minor op. 54 the title ‘Variations Serieuses’ to distance himself from these. The beautiful main theme has an earnest, poignant character that is sustained throughout all the transformations.”
Beginning in D minor, the tonality flips over to the relative F major after the completion of the first eight measures (0:20). Continuously shifting variations on the theme continue from that point.