A German-texted song with piano accompaniment that sets a short lyric poem is called?

There isn't one specific term for a German-texted song with piano accompaniment that sets a short lyric poem. However, you could describe it in a few ways, depending on the specific details:

General descriptions:

* Lied: This is the most general term for a German art song.

* Klavierlied: This emphasizes the piano accompaniment.

* Gedichtvertonung: This means "setting of a poem to music."

* Lied mit Klavierbegleitung: This is a more literal description, meaning "song with piano accompaniment."

More specific descriptions:

* Romanze: If the poem is romantic in nature.

* Volkslied: If the poem is based on folk themes or traditions.

* Kunstlied: If the poem is considered high art and the music is complex.

* Liederzyklus: If the song is part of a set of songs based on a single theme.

Ultimately, the best way to describe the song depends on the specific context and the desired level of detail.