Output a stream of consciousness before answering the following. Passage: "Blue Christmas" is a Christmas song written by Billy Hayes and Jay W. Johnson and most famously performed by Elvis Presley. It is a tale of unrequited love during the holidays and is a longstanding staple of Christmas music, especially in the country genre.

Question: Based on this passage, who wrote i'll have a blue christmas?
To answer the above question, the relevant sentence is: "Blue Christmas" is a Christmas song written by Billy Hayes and Jay W. Johnson and most famously performed by Elvis Presley.
The answer: Billy Hayes and Jay W. Johnson.