Glee creator Ryan Murphy is giving fans of the show a chance to choose the songs for the special anniversary episode.
Fans can vote for their favourite from a list of 30 previously performed hits. The top ten tracks will then be remixed and performed by the current cast for the milestone episode, which is due to air next year.
Hits on the list include some of the most popular tunes sung over Glee's past five seasons, from season one's Don't Stop Believin', to the cast's original song Get It Right.
Voting is now open via the Glee website and Facebook page until December 3.
The episode is set to feature McKinley High's seniors approaching graduation and reminiscing about their most memorable moments.