The song sung by Kirk at the wedding. It’s a country pop song, written by Alan Block and Don Hecht in 1954, first recorded by Lynn Howard with The Accents in 1956.
It is best known for the version sung by country music artist Patsy Cline, first performed in 1957 on the television show, Arthur Godfrey’s Talent Scouts. Despite Cline not liking the song, she won first place in the TV contest, and there was such a strong audience response to the song that it was rushed out as a single within a month.
“Walkin’ After Midnight” became Patsy Cline’s first major hit, selling over a million copies, and reaching #12 on the charts, #2 on the country music charts.
The song is about someone so lonely after a breakup that they go for long walks in the early hours of the morning, unable to sleep for the misery. It’s a suitable choice for Kirk, who had earlier confessed his loneliness to Luke.
The Annotated Gilmore Girls 