A song whose text is a short lyric poem in German with piano accompaniment is called a Lied (plural: Lieder).
Explanation:
- Lied literally means "song" in German.
- In classical music, a Lied is specifically a setting of a German poem to classical music, typically for a solo voice with piano accompaniment.
- Famous composers of Lieder include Franz Schubert, Robert Schumann, and Johannes Brahms.
If you want, I can provide examples or more details about this musical form!