The Adieu Op. 85 no. 2 is Felix Mendelssohn's 38th Song without Words. These "Songs without Words" (or "Lieder ohne Worte") were a popular form of expression with the composer, and in total he published 48 such piano pieces in 8 sets of 6 during his tragically short life as a composer. The song titles of these works were added later by publishers rather than by the composer himself and this one is known as "The Adieu".
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The image below is the first page of the sheet music, and here you can download the full sheet music for Mendelssohn's Song without words Op.85 No.2 The Adieu for piano in PDF format.