What is a lieder by Schubert?

A lieder by Schubert is a vocal composition typically written for solo voice and piano and based on a German poem. Lieder is the plural of lied, which means "song" in German. Schubert composed over 600 lieder during his lifetime, and they are considered some of the most important and beloved examples of the genre. His lieder are known for their beauty, their emotional depth, and their perfect marriage of music and poetry. Some of his most famous lieder include "Gretchen am Spinnrade" (Gretchen at the Spinning Wheel), "Der Erlkönig" (The Erlking), and "Die Winterreise" (The Winter Journey).