Whoops, didn't realize the line breaks would be lost in the Ballad Index info. Here's another try:

Grey Cock, The, or, Saw You My Father [Child 248]
DESCRIPTION: Man bids his love to let him in. After some hours of lovemaking, he tells her he must depart when the cock crows (or before). She hopes the cock will not crow soon, but it crows early. She learns that her lover is a ghost, and may never return
AUTHOR: unknown
EARLIEST DATE: 1769 (Herd)
LONG DESCRIPTION: Man comes to his lover's window, bidding her open and let him in. They spend the night in lovemaking; toward dawn, he tells her he must leave when the cock crows for day. She prays the cock not to crow too soon, but the cock in fact crows early. She remarks her lover's cold lips and skin, realizing he has returned to her dead. As he leaves, she asks when she will see him again; he replies with impossibilities ("When the fish they fly, love, and the sea runs dry, love/And the rocks they melt in the heat of the sun") -- i.e., at the Judgment Day.
KEYWORDS: love sex farewell death dialog nightvisit paradox supernatural lover ghost
FOUND IN: Britain(England(South,West),Scotland) US(Ap,SE) Canada(Mar,Newf) Ireland
REFERENCES (8 citations):
Child 248, "The Grey Cock, or, Saw You My Father" (1 text)
Bronson 248, "The Grey Cock, or, Saw You My Father" (16 texts)
Leach, pp. 611-612, "The Grey Cock" (2 texts)
Warner 90, "Pretty Crowin' Chicken" (1 text, 1 tune)
Vaughan Williams/Lloyd, pp. 52-53, "The Grey Cock, or The Lover's Ghost" (1 text, 1 tune)
Hodgart, p. 148, "The Grey Cock" (1 text)
SHenry H699, p. 383, "The Bonny Bushes Bright" (1 text, 1 tune)
DT 248, GREYCOCK*
RECORDINGS:
A. L. Lloyd, "The Lover's Ghost" (on Lloyd1) (Lloyd2, Lloyd3)
CROSS-REFERENCES:
cf. "Night Visiting Song" (motif)
Notes: [Of Bronson's sixteen versions,] only one is of the Night Visiting Song type and one of the I Once Loved a Lass type. - AS
File: C248
Makes me appreciate Malcolm's entries even more to go through that. He even gets the bolding in...

~ Becky in Tucson