For a bit more information on the episode

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STARS ALIGN IN SPRINGFIELD FOR SEASON 22 OF “THE SIMPSONS”
Lea Michele, Cory Monteith, Amber Riley, Hugh Laurie, Halle Berry, Ricky Gervais,
Daniel Radcliffe, Jemaine Clement, Bret McKenzie, Mark Zuckerberg, Mike Scioscia,
Martha Stewart, Paul Rudd, Rachel Weisz, Cheech & Chong, Jon Hamm, Kristen Wiig,
Alyson Hannigan, Danica Patrick, Kareem Abdul-Jabbar and Joe Mantegna
Among Guest Voices for Upcoming Season
Lea Michele, Cory Monteith, Amber Riley, Hugh Laurie, Halle Berry, Ricky Gervais, Daniel Radcliffe, Jon Hamm and Martha Stewart are among the guest voices in the upcoming 22nd season of THE SIMPSONS premiering Sunday, Sept. 26 (8:00-8:30 PM ET/PT) on FOX.
In “Elementary School Musical,” the season premiere episode, MARGE (Julie Kavner) sends LISA (Yeardley Smith) to a performing arts camp where artsy counselors (guest voices Jemaine Clement and Bret McKenzie of “Flight of the Conchords”) and fellow musically inclined campers (guest voices Lea Michele, Cory Monteith and Amber Riley of GLEE) inspire her to embrace her creative side. After she returns to Springfield, Lisa becomes restless with her ho-hum suburban lifestyle and catches the first bus to Sprooklyn in hopes of reconnecting with her inner hipster.
Click for the rest of the press release