The second half of the 'Glee' two-part 100th episode celebration airs tonight, March 25. Last week, viewers heard six retooled, fan-voted songs, and this week bring six more! Here's what you need to know.

The episode features two special guest stars as April (Kristin Chenoweth) and Holly (Gwyneth Paltrow) conspire to save the New Directions. Following a massive fight, Rachel (Lea Michele) and Santana (Naya Rivera) will try to mend their friendship.

Of course, throughout all of this action, the cast will be performing some show-stopping tunes, including 'Total Eclipse of the Heart' with Will and April, 'Just Give Me a Reason' with Puck and Quinn, and the show's most well-known cover, 'Don't Stop Believin' with the New Directions and Will.

Gleeks, get a sneak peek at all of the songs in the videos below, and be sure to check out the episode when it airs tonight (March 25) at 8PM ET on FOX.

Listen to 'I Am Changing'

Listen to 'Total Eclipse of the Heart'

Listen to 'Party All The Time'

Listen to 'Loser Like Me'

Listen to 'Be Okay'

Listen to 'Just Give Me A Reason'

Listen to 'Don't Stop Believin''