Final answer:
The provided texts do not contain information about Hsaing-ling or her wedding procession. Instead, they narrate events related to Hong Pansa and his son Gil-Dong. There might be a confusion with character names or plot details as they do not match the asked question.
Step-by-step explanation:
From the provided texts, there is no direct mention of Hsaing-ling or a specific situation involving her hearing something during her rainy wedding procession. The passages instead provide various narratives about Hong Pansa, a character who experiences different events, such as encountering a man descending from a tree on the back of a stork who reveals himself to be Hong Pansa, or the birth and upbringing of his son, Gil-Dong.
One of the pieces of text appears to be unrelated and involves a character named Calixta during a rainstorm. Since the question may pertain to another part of the story not provided in the text excerpts, or it may be a case of mixing up character names and plot details, we are unable to accurately answer the question about what Hsaing-ling heard during her rainy wedding procession.