This is a poignant Schubert Lied, set to a text lamenting the death of a nightingale. Its beauty lies in its delicate melodic lines and expressive harmonies, capturing a sense of profound sadness.
Focus on creating a singing tone and conveying the emotional depth of the melody through subtle dynamic shaping.
Auf den Tod einer Nachtigall(2nd setting) (D.399) is rated Henle level 5 of 9 — late intermediate repertoire, roughly ABRSM grades 6–7. In the RCM system it corresponds to about level 7.
You should be comfortable at Henle level 5 — meaning you can already play level 4–5 pieces cleanly. Learning it one level early is possible as a stretch piece, but more than that usually leads to months of frustration.
A typical performance of Auf den Tod einer Nachtigall(2nd setting) (D.399) lasts about 3.5 minutes.
Auf den Tod einer Nachtigall(2nd setting) (D.399) is available as free public-domain sheet music on IMSLP — the score is linked directly from this page.