Six Maids in a Pool
Six maids there were in a spring-fed pool...
A Storm of Swords
When Jaime Lannister, Brienne of Tarth and Ser Cleos Frey pass through Maidenpool they espy the spring-fed pool from which the town took its name, where legend says Florian the Fool had first glimpsed Jonquil bathing with her sisters.
The pool is so choked with rotting corpses that the water had turned into a murky grey-green soup. Jaime takes one look at it and bursts into the song "Six Maids in a Pool", until Brienne tells him to be quiet.
A Feast for Crows
Brienne passes through Maidenpool during the early part of her quest to find Sansa Stark. Brienne finds herself reminiscing,
Jaime sang “Six Maids in a Pool,” and laughed when I begged him to be quiet.