This section is from the book "Ancient Legends, Mystic Charms, And Superstitions Of Ireland", by Jane Francesca Wilde. Also available from Amazon: Ancient Legends, Mystic Charms, And Superstitions Of Ireland.
At many of the wells quantities of beautiful white stones are found that glitter in the sun, and these are highly esteemed by the pilgrims to build up their prayer monuments.
One day some women were eagerly collecting these stones, after each round of praying, in order to build up a monument ; when suddenly a strain of soft, exquisite music seemed to rise up from the water and float by them. In their joy and wonder the women clapped their hands and laughed aloud, when instantly the music ceased, and the pile of stones fell down. By which sign they knew that they should not have laughed while the angels were singing ; and they fell on their knees and prayed.
A holy well once lost all its power because a murder had been committed near it ; and another because it was cursed by a priest in consequence of the immorality that pervailed at the patterns.