François-Joseph Naderman's "6 Romances" are likely Classical-era compositions, possibly for harp or piano, known for their elegant and lyrical qualities. They often feature graceful melodies and clear textures.
Focus on creating a singing tone and maintaining a clean, transparent texture throughout the pieces.
6 Romances is rated Henle level 5 of 9 — late intermediate repertoire, roughly ABRSM grades 6–7.
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.
6 Romances is available as free public-domain sheet music on IMSLP — the score is linked directly from this page.