Short Answer 
The analogy compares the relationship between a letter and a word, and a note and a song, indicating both letters and notes are building blocks of their respective whole. The correct answer to complete the analogy ‘Letter is to word as note is to _______’ is ‘song’.
Identify the Relationship
The analogy compares two sets of items based on their relationships. In this case, a letter is a smaller unit that contributes to forming a word. Similarly, a note is a smaller component that makes up a song. Recognizing this relationship is crucial in finding the correct answer.
Find the Correct Terms
Within the analogy, identify the pairs: one is letter to word, and the other is note to an unknown term. The task is to complete the second pair based on the same relationship established in the first pair. Understanding that both letters and notes are building blocks can guide you to the right choice.
Select the Answer
After establishing the relationship, examine the provided options. Since a letter composes a word much like a note composes a song, the correct answer must be song. Thus, the completion of the analogy ‘Letter is to word as note is to _______’ is clearly song, which is found in Option B.