This is the primary version of the 'Baráti fölhívás' composition. It is a quintessential example of 19th-century salon romanticism with a focus on melodic beauty.
Consistent voicing is critical to maintain the long, lyrical lines.
Comparable difficulty and character — good candidates for what to learn next.
Baráti fölhívás is rated Henle level 4 of 9 — intermediate repertoire, roughly ABRSM grades 5–6. In the RCM system it corresponds to about level 6.
You should be comfortable at Henle level 4 — meaning you can already play level 3–4 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 Baráti fölhívás lasts about 4 minutes.
Baráti fölhívás is available as free public-domain sheet music on IMSLP — the score is linked directly from this page.
Pieces at a comparable difficulty and character include Baráti fölhívás by Béla Kéler, Brigadier-Marsch by Béla Kéler, Berliner Kinder, Walzer by Béla Kéler — see the full similar-pieces list on this page.