What would a 'Prom Queen' episode of 'Glee' be without ABBA's 'Dancing Queen?' Fortunately, we won't have to find out, because the cast will perform the song on this week's program.

The 'Glee' version is nearly identical to the original, which is just fine -- there's no need to mess with disco-pop perfection.

Mercedes and Santana take the roles of ABBA singers Agnetha Faltskog and Anni-Frid Lyngstad, sharing the vocals about a girl who finds the groove and has the time of her life.

Given that ABBA haven't performed together since 1982 and steadfastly refuse to do a reunion tour, the 'Glee' performance of 'Dancing Queen' is about as close as we'll probably ever get to the real thing.

'Dancing Queen' leads an exciting lineup of pop covers on this week's 'Glee' episode, including Rebecca Black's 'Friday,' Christina Perri's 'Jar of Hearts,' and Black Kids' underappreciated pop gem 'I'm Not Gonna Teach Your Boyfriend How to Dance With You.'

Rating: 9/10

Listen to the 'Glee' Cast's 'Dancing Queen'