Final answer:
In Franz Schubert's "Erlkönig", the boy's fear of the Elf-King is expressed through dynamic changes, dissonant harmonies, and a faster tempo.
Step-by-step explanation:
In Franz Schubert's song "Erlkönig", the composer expresses the boy's fear of the Elf-King through various musical techniques. Schubert uses dynamic changes, dissonant harmonies, and a faster tempo to create a sense of tension and unease. For example, in the opening section of the song, the repeated notes and fast melodic lines mimic the sound of the horse's galloping, heightening the boy's fear. Additionally, Schubert's use of minor keys and chromatic passages adds a haunting and eerie quality to the music, further emphasizing the boy's fear of the supernatural creature.