Final answer:
High-pitched, continuous musical sounds heard over the bronchi on expiration in a patient with pneumonia are known as wheezes.
Step-by-step explanation:
In a patient with pneumonia, high-pitched, continuous musical sounds heard over the bronchi on expiration are called wheezes. Wheezes are associated with the narrowing of airways and can often be heard in conditions like asthma and chronic obstructive pulmonary disease (COPD), in addition to pneumonia. The other sounds mentioned are rhonchi, which are lower-pitched sounds that resemble snoring, crackles, which are high-pitched popping sounds, and friction rubs, which are sounds produced by the rubbing of pleural surfaces against each other. Therefore, the correct answer to the question is C. Wheezes.