The troubadour who is singing as Luke and Lorelai argue is Sam Philips, the same artist who writes and performs all of the series' original music; her song "Reflecting Light," is notably used as the first song Luke/Lorelai waltz to at Liz's wedding.
The troubadours featured, in order of appearance, are: Joe Pernice, Sparks, Dave Allan Gruber, Mary Lynn Rajskub, Yo La Tengo, Sonic Youth, and Sam Phillips, and series writer/director Dan Palladino.
This was the last original episode of the series to be broadcast on the WB Television Network.
In this episode, we hear Lorelai say I love you for the first time