All Songs From GLEE's 'The Back-Up Plan' Now Available

All songs from this week's "The Back-Up Plan" episode of FOX's hit musical dramedy series Glee are now available to hear, including song selections originally popularized by Janis Joplin, Lauryn Hill, One Direction, Bette Midler and more.

Of note, Shirley MacLaine makes her debut in this week's episode, duetting with Darren Criss on the Janis Joplin rock classic "Piece Of My Heart".

The official description of GLEE's "The Back-Up Plan" is as follows: "With Funny Girl a bonafide hit and Rachel's star clearly on the rise, she enjoys the fruits of her labors, including signing with a powerful New York talent agent who seems to have a wholly different take on her career path than she does. Just as the monotony of constantly performing the same show over and over again starts taking its toll on her, Rachel is approached by a Hollywood executive who presents the young star with a potentially once-in-a-lifetime opportunity that - while too tempting to refuse - requires her to take a calculated risk. At NYADA, Kurt gets a valuable opportunity to perform for a wealthy socialite who is known for fostering and launching the careers of many burgeoning artists. Thrilled with the chance to make a lasting impression, Kurt - committed to the idea that he and Blaine should always share their career boons together - recruits his fiancé to sing with him. Blaine finds himself put in a difficult position when the socialite takes more of a liking to him than to Kurt. Meanwhile, as Mercedes struggles to complete her latest single in time to meet her release deadline, she turns to Santana for help with finding a "new sound," and ends up putting her own career on the line for the sake of her friend."

GLEE airs Tuesdays at 8 PM on FOX.

More information on GLEE: The Music is available at the official site here.

Listen to the songs from this week's "The Back-Up Plan" episode of Glee below.