What are the characteristics of Schubert's art songs?

Schubert is a famous Austrian composer, in the history of the development of European music, he is a pioneering artist. Schubert and his art songs created the Romantic school of music. He brought the traditional genre of songs with piano accompaniment to a high level of artistic perfection. His vocal suite "Winterreise" and "The Beautiful Mill Woman" portrayed a colorful, vivid, profound and popular musical image, which reached a new artistic realm that had not been reached by the previous generation, and was the crystallization of Romantic music and art. As a great composer, Schubert made an important contribution to the development of the art song, "He was the first to regard harmony, accompaniment, melody and lyrics as equally important. They say that through Schubert's hands all poetry becomes music." But his music did not yield blindly to poetry, but gave it a new connotation and made it vigorous. Even mediocre poetry could be composed into life-affirming songs if he felt like it. He perfected the genre of art song and had a significant and far-reaching influence on later generations.