Answer
**Eric Fenby, a fellow composer, became Delius's amanuensis in the 1920s when Delius was suffering from ill health that left him partially blind and unable to physically write down musical ideas.** Delius would dictate musical themes to Fenby, who would then notate them on paper. This collaboration enabled Delius to continue composing even in his diminished state, resulting in several significant works, including "A Song of Summer" and "Irmelin."