Glee's 500th Musical Performance image

(Adam Rose/FOX)

Special occasion.

To mark "Glee's" 500th musical performance, New Directions will perform The Isley Brothers' "Shout." The performance will be seen in the "Girls (And Boys) on Film" episode, which tasks the glee club with singing songs from movies. "Shout" was featured in "Animal House."

The milestone will air on March 7 after "American Idol's" special 90 minute episode. "Girls (And Boys) on Film," which will be seen at 9:30 PM – 10:30 PM EST, will also feature Santana (Naya Rivera), who makes herself comfy in the NYC loft, to Rachel (Lea Michele) and Kurt's (Chris Colfer) discomfort.

Get a look at what's about to go down at Will and Emma's wedding in the Glee Spoiler Video: I Do and go to Soap Scoop: UK/Australia Edition for details on Toadie and Sonya's wedding gone wrong on "Neighbours."

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- Lori Wilson