Franz Schubert, Carl Maria von Weber, and John Field are among the most prominent in this generation of "Proto-Romantics", along with the young Felix Mendelssohn. Their sense of form was strongly influenced by the Classical style. While they were not yet "learned" composers (imitating rules which were codified by others), they directly responded to works by Beethoven, Mozart, Clementi, and others, as they encountered them. The instrumental forces at their disposal in orchestras were also quite "Classical" in number and variety, permitting similarity with Classical works.