AUDIO: Full Tracks from GLEE's 'Spanish Teacher' Episode!

Next week on GLEE, Will assigns the glee club a Spanish singing assignment, and enlists the help of his musically-inclined night school teacher (Guest star Martin). Meanwhile, Rachel spills the beans to Kurt and Mercedes on Finn's marriage proposal, and Mercedes has love complications of her own. Check out full clips from the episode, which include 'La Isla Bonita,' 'Sexy and I Know It,' 'Bamboleo/Hero,' 'Don't Wanna Lose You,' and 'A Little Less Conversation,' below!

Now in its third season, GLEE is a musical comedy about a group of eager and ambitious students who strive to outshine their singing competition to win Nationals while navigating the cruel halls of McKinley High. Since its debut, GLEE has become a bona fide cultural phenomenon, received prestigious honors including the Golden Globe and Peabody Award and singlehandedly made glee clubs cool again.

In addition to the regular cast, GLEE has featured guest appearances by a wide range of talented performers, including Gwyneth Paltrow (who won the 2011 Emmy Award for Outstanding Guest Actress in a Comedy Series), Carol Burnett, Kathy Griffin, Cheyenne Jackson, John Stamos, Britney Spears, Kristin Chenoweth, Idina Menzel, Jonathan Groff, Molly Shannon, Olivia Newton-John and Neil Patrick Harris, who won a 2010 Emmy Award for Outstanding Guest Actor in a Comedy Series for his work on the show.