Why is "List of songs in Glee season 1" trending?

Wikipedia Overview

Glee is an American musical comedy-drama television series that aired on the Fox network in the United States. It focuses on the William McKinley High School glee club New Directions competing on the show choir competition circuit, while its members deal with relationships, sexuality and social issues. The show was created by Ryan Murphy, Brad Falchuk and Ian Brennan, and features many cover versions of songs performed on-screen by the characters. Murphy is responsible for selecting all of the songs used, and strives to maintain a balance between show tunes and chart hits, as he wants there to be "something for everybody in every episode". Once Murphy selects a song, rights are cleared with its publishers by music supervisor P.J. Bloom, and music producer Adam Anders rearranges it for the Glee cast. Numbers are pre-recorded by the cast, while choreographer Zach Woodlee constructs the accompanying dance moves, which are then taught to the cast and filmed. Studio recordings of tracks are then made. The process begins six to eight weeks before each episode is filmed, and can end as late as the day before filming begins.