Schubert Multiple Choice was widely acknowledged as a composer in his lifetime. was very self-critical, which accounts for his meager output. produced his greatest works after the age of forty. was the first great master of the romantic art song.

was the first great master of the romantic art song

Explanation:

Franz Peter Schubert was an Austrian composer known for being the first great master of the romantic art song. There are more than 600 songs that were created by him, not counting the number of operas symphonies, sonatas, solos and other works. Within music, he is considered one of the greatest composers of the 19th century, having contributed more intensively to classical and romantic music.