Don't Stop Believin' by Journey is featured in Pilot, the first episode of Season One. It is also the final performance of the first part of the series finale, in Season Six. It is sung by the New Directions with solos by Finn and Rachel.

The New Directions sing this song in the McKinley auditorium to show their unity as a group, while Will watches them from afar with a gleeful smile on his face. Little do they know, Puck, Sue, Quinn, and Santana are also watching them.

It is one of the show's most prominent songs during Season One and has become the show's anthem. It has later on been reprised multiple times in the show.

Glee (stylized in all lowercase as glee) is an American jukebox musical comedy-drama television series created by Ryan Murphy, Brad Falchuk, and Ian Brennan for the Fox Broadcasting Company. wiki

Hey, who doesn't like Star Wars but sorry to disappoint but Jedi don't exist, we're not in Morroco, this isn't Comicon and that's the only place you're going to find R2 and C3-PO.

this would actually be an example of a Bazinga and also one of our favourite topics