As 'Glee' releases its official teaser video for the Cory Monteith tribute episode, viewers cannot help but wonder about the song that his on-and-off-screen girlfriend Lea Michele will sing in the last scene.

The episode, which is titled 'The Quarterback', will portray how the McKinley High family will say goodbye to Finn Hudson. Apart from being a famed football player in the series, he is similarly a member of the glee club.

The production team had to include the tribute episode after 31-year-old Monteith's sudden passing on July 31, a few weeks before the start of the filming for the fifth season.

The teaser video has a caption which says, "The hardest word to say is goodbye." Michele, who plays Rachel Berry, can be heard singing Adele's 'Make You Feel My Love'. However, it isn't confirmed yet whether the song is indeed Berry's farewell music.

As previously reported, the episode will have the following track list:

-"Seasons of Love" from "Rent"

-"I'll Stand By You" by The Pretenders

-"Fire and Rain" by James Taylor

-"If I Die Young" by The Band Perry

-"No Surrender" by Bruce Springsteen

-"Make You Feel My Love" by Bob Dylan, covered by Adele

The farewell episode will be airing on Thursday, October 10, at 9 p.m.