On tonight's (April 29) episode of 'Glee,' dubbed 'Back-Up Plan,' the crew sings songs by One Direction, Lauryn Hill and more.

As for the plot deets, Rachel auditions for a TV pilot, which totally jeopardizes her lead in 'Funny Girl' on Broadway. Talk about an embarrassment of riches for our girl Rachel!

Also, Amber Riley returns as Mercedes, trying to help Santana get in on her recording deal. Iconic actress Shirley MacLaine guest stars as an older socialite whom Blaine befriends.

The ep airs at 8PM on FOX.

You can check out the songs that are performed tonight, which include Rachel offering her take on Avicii's smash 'Wake Me Up,' which she turns into a softer, silkier ballad, while Mercedes and Santana team up on a polished version of the Miss Hill classic 'Doo Wop (That Thing).' Kurt and Blaine go in, well, One Direction with 'Story of My Life,' while Blaine and June take on Janis Joplin's 'Piece of My Heart.' They really rock the heck out on this one!

It's a nice, varied mix of styles and genres, which are totally gleeked out!

The standout track, though, is Rachel's delivery of 'The Rose,' a classic by Bette Midler. It is absolutely haunting and sounds like it was made for Lea Michele's voice. She suh-lays it.

Listen to 'Wake Me Up'

Listen to 'Doo Wop (That Thing)'

Listen to 'Story of My Life'

Listen to 'Piece of My Heart'

Listen to 'The Rose'