What is generally considered the main tool of a composer?

The main tool of a composer is generally regarded as the musical staff. The musical staff serves as the foundational framework for writing music. It consists of five lines and four spaces, which correspond to different pitches. This structured approach allows composers to notate melodies, harmonies, rhythms, and other musical expressions clearly and accurately.

While a pencil, piano, and computer might assist in composing, they do not represent the primary method of recording musical ideas. The staff is essential because it directly relates to the organization of notes and symbols that convey specific instructions for performance. Composers utilize the staff to communicate their musical intentions to musicians, making it a vital instrument of the trade.