Tony Award nominee Matthew Morrison stars on the series as McKinley High teacher and glee club director Will Schuester. In the first season of the Fox musical series, Rachel Berry (Lea Michele) was overcome with her teacher's irresistible charm and was convinced Schuester was interested. Of course, the only way "Mr. Shu" gets through to his students on "Glee" is by performing. To set things straight, he sang a mashup of The Police's "Don't Stand So Close To Me" and "Young Girl" by Gary Puckett & the Union Gap.
Bryan Ryan, played by Broadway favorite Neil Patrick Harris, guest starred on the series' first season as a board member at William McKinley High School. (He is also a longtime rival of Will Schuester's). Here, Morrison and Harris face off to the Aerosmith rock number "Dream On." Morrison and Harris sharing the stage—dream is right!
Jane Lynch stars as McKinley High's other favorite (or not-so-favorite) teacher, Sue Sylvester. Although she doesn't have many moments to showcase her vocal abilities, the "Glee" Madonna-themed episode gave Lynch a chance to "Vogue."
In the first season of "Glee," Tony Award winner Idina Menzel guest starred as the director of the rival glee club Vocal Adrenaline. When we find out that Shelby Corcoran is also the biological mother of Rachel (Michele), her daughter requests a duet with her mom—the two cover a ballad version of Lady Gaga's "Poker Face."
Another great moment from Mr. Schuester (Morrison) is the performance of "Tell Me Something Good." Here, he attempts to seduce Sue (Lynch), which is part of his plan on getting revenge against Coach Sylvester and the Cheerios.
In the Rocky Horror-themed episode of "Glee," McKinley High School guidance counselor Emma Pillsbury, played on the series by Jayma Mays, also partakes in the Rocky action. To get Schuester's (Morrison) attention, she performs Janet's second act number, "Touch-a, Touch-a, Touch Me."
Holly Holliday, played by guest star Gwyneth Paltrow, was introduced in the series' second season. When Schuester (Morrison) is sick and unable to come to work, Holly is called in to substitute teach. In her first appearance she performed Cee Lo Green's hit song, "Forget You," winning over both the New Directions and the die-hard fans of "Glee." Thank goodness she was cast in a multi-episode arc!
In Paltrow's last appearance on "Glee," she said goodbye to the glee club—and temporary fling Will Schuester (Morrison)—with her rendition of Adele's "Turning Tables."
When Menzel returned to "Glee" on the series' third season—this time as a McKinley High staff member and director of the all-girl glee club The TroubleTones—she joined Morrison for a mashup of Lady Gaga's "You and I" and Eddie Rabbit's "Just You and I."
And, in case you missed it, here is Martin's performance of LMFAO's "Sexy and I Know It"—the title pretty much sums things up!