Final answer:
The repetition of letters in the musical scale is designed to establish a familiar and repetitive pattern that is essential for the structure of music. This allows for the development of melodies and harmonies across octaves, providing a consistent framework for musical composition.
Step-by-step explanation:
The purpose of repeating letters in the musical scale is to create a sense of repetition and familiarity. This repetition establishes the pattern of the musical scale, which is fundamental for understanding and creating music. It's important to note that when we talk about repeating letters in the context of a musical scale, we usually mean that the scale repeats its sequence from one octave to another, providing a consistent foundation upon which melodies and harmonies can be built. Therefore, the correct answer is 1) To create a sense of repetition and familiarity.
When analyzing music, one might underline all repetitions or devices of sound to understand their effects. These devices could induce various emotions and responses in a listener or add depth to the music. Repetitions, whether they are melodic patterns, rhythmic sequences or even repeated notes, often serve to create a musical theme or motif, making the music more memorable and engaging to the audience.