The song from Wicked with the line “because I knew you” is “For Good,” the Act Two farewell duet between Elphaba and Glinda. Stephen Schwartz wrote it for the 2003 Broadway musical, where Idina Menzel and Kristin Chenoweth first sang it. Cynthia Erivo and Ariana Grande sing it again in 2025’s Wicked: For Good, the second film, which takes its title straight from the song.
Key Takeaways
– The song: “For Good,” music and lyrics by Stephen Schwartz, from Wicked (Broadway, 2003).
– The line you’re thinking of: “Because I knew you, I have been changed for good.”
– Who sings it: Elphaba and Glinda. That was Idina Menzel and Kristin Chenoweth on Broadway, and Cynthia Erivo and Ariana Grande in the films.
– Where it falls: Late in Act Two, the last time the two friends see each other before the climax.
– Where to hear it: The 2003 Original Broadway Cast Recording (Decca Broadway), the Wicked: For Good soundtrack, and nightly at the Gershwin Theatre in Manhattan.
The Song You’re Looking For
If a few words have been looping in your head since the movie, here’s the full answer. The song is “For Good.” The lyric is “Because I knew you, I have been changed for good,” and the whole song builds to it.
It’s a duet, though the singers mostly trade verses until the very end. Then the two voices finally lock together on that line, and the harmonies are what usually get people.
The double meaning is the whole trick. “For good” means permanently. It also hints at for the better, and the lyric openly admits it can’t promise which one. Glinda even sings that she can’t say whether she’s been changed “for the better.” That honesty is why the song works at weddings, graduations and funerals without ever sounding like a greeting card.
Where “For Good” Happens in Wicked
You don’t need spoilers to understand the setup. Wicked follows Elphaba, the green-skinned girl who becomes the Wicked Witch of the West, and Glinda, the popular blonde who becomes Glinda the Good. They start as roommates who loathe each other at Shiz University and end up as the closest friends either of them will ever have.
By Act Two, Oz has turned on Elphaba. A mob is coming for her. Glinda slips away to see her one last time, and both of them know it’s a goodbye.
The song moves through four clear beats:
- Elphaba opens with “I’m limited.” She hands her cause to Glinda, who has the public trust Elphaba will never get.
- Glinda answers with “I’ve heard it said.” Her verse leans on images of collision and redirection, like a comet pulled from orbit or a stream meeting a boulder.
- Elphaba’s verse is the confession. She admits that so much of who she is came from Glinda, “like a handprint on my heart.”
- The apology exchange, then the unison. Glinda asks forgiveness for the things Elphaba blames her for. Elphaba says there’s blame to share. Then they sing the title line together.
That apology exchange is the part people skip past, and it shouldn’t be. It’s what keeps the song from being pure sentiment. These two hurt each other, and the song says so out loud.
The Story Behind the Song
Schwartz has told the origin story in interviews and in Carol de Giere’s biography Defying Gravity. Stuck on how to write the goodbye, he went to his daughter Jessica. He asked her what she would say to her best friend if she knew they’d never see each other again.
Her answers fed the lyric. That’s why “For Good” sounds less like two characters talking about plot and more like one person trying to sum up a friendship before time runs out.
The broader context matters too. Wicked is adapted from Gregory Maguire’s 1995 novel Wicked: The Life and Times of the Wicked Witch of the West, with a book by Winnie Holzman. Maguire’s novel is far darker and less interested in the friendship. The musical’s shift to center Elphaba and Glinda’s relationship is what made a song like “For Good” necessary in the first place.
Schwartz came to it with a long résumé. He wrote Godspell (1971) and Pippin (1972), and he has won three Oscars: two for Disney’s Pocahontas, including “Colors of the Wind,” and one for “When You Believe” from The Prince of Egypt. “For Good” might be the most quietly personal thing he’s written.
The Original Broadway Version: Menzel and Chenoweth
Wicked tried out at San Francisco’s Curran Theatre in spring 2003. It opened on Broadway at the Gershwin Theatre on October 30, 2003. Idina Menzel won the 2004 Tony for Best Actress in a Musical, and Kristin Chenoweth was nominated in the same category.
The Original Broadway Cast Recording, released by Decca Broadway in December 2003, won the Grammy for Best Musical Show Album at the 47th Annual Grammy Awards in 2005. It’s still the version most people mean when they say “the” recording of “For Good.” Menzel’s lower, grounded tone against Chenoweth’s bright soprano is a contrast that’s hard to match. Nearly every Elphaba and Glinda pairing since has been measured against it.
The two reunited for NBC’s A Very Wicked Halloween in 2018, the special marking the show’s 15th anniversary, and closed with “For Good.” Clips of that performance still circulate widely, and you can tell neither of them got through it entirely dry-eyed.
The Movie Version: Erivo and Grande
Universal split the stage show into two films, both directed by Jon M. Chu. Wicked (2024) covered Act One and ended on “Defying Gravity.” It won Oscars at the 97th Academy Awards for Paul Tazewell’s costumes and for production design by Nathan Crowley and Lee Sandales.
Wicked: For Good opened November 21, 2025, and covers Act Two. That makes “For Good” the emotional destination of the whole two-film project. Choosing it as the subtitle tells you exactly where the studio thinks the heart of the story is.
Cynthia Erivo and Ariana Grande recorded much of their singing live on set rather than lip-syncing to studio tracks. Chu talked about this repeatedly during the press tour for the first film. On “For Good,” the approach pays off. You can hear breath, catches and small imperfections that a polished studio take would smooth out. Grande’s Glinda is softer and more fragile than Chenoweth’s. Erivo’s Elphaba carries more weariness than Menzel’s defiance.
Schwartz also wrote two new songs for the second film: “No Place Like Home” for Elphaba and “The Girl in the Bubble” for Glinda. Neither replaces “For Good” as the centerpiece, and they weren’t designed to.
Where to Watch and Listen Right Now
| Version | Where to find it |
|---|---|
| Wicked (2024) | Streaming on Peacock; rent or buy on major digital storefronts |
| Wicked: For Good (2025) | Released theatrically November 21, 2025; Universal titles move to digital rental and then Peacock after their theater run |
| Original Broadway Cast Recording (2003) | Spotify, Apple Music, Amazon Music and other major services |
| Wicked: For Good soundtrack | All major streaming music services |
| Live on stage | Gershwin Theatre, 222 West 51st Street, Manhattan, plus touring productions |
If you’re in New York, the Gershwin is still the best way to hear it. Wicked passed its 20th anniversary on Broadway in October 2023 and ranks among the longest-running shows in Broadway history. Hearing “For Good” in the room is a different experience from the cast album, even if your seats are in the back mezzanine.
For the film, keep an eye on sing-along screenings at Brooklyn spots like Nitehawk and the Alamo Drafthouse downtown, which have run them for big movie musicals. Wicked: For Good landed the same Thanksgiving corridor as Zootopia 2, so it got a crowded but very long theatrical run.
Why This Song Sticks
Plenty of musicals have friendship songs. Few become the default song people reach for at real-life goodbyes. Here’s why “For Good” did.
- It isn’t romantic. Most big Broadway duets are love songs. “For Good” is about friendship, which makes it usable in situations a love ballad can’t touch.
- It admits ambivalence. “Changed for good” leaves room for “and maybe not entirely for the better.” Real friendships are like that.
- It saves the harmony. Holding back the unison until the end makes the payoff land harder.
- The melody is singable. Unlike “Defying Gravity,” a non-professional can actually get through it, which is why it shows up at choir concerts and school graduations every June.
It belongs to a small club of musical numbers that escape their source and get lodged in your head for months. Last year “Golden” from KPop Demon Hunters did the same thing to a new generation. “For Good” has been doing it for over two decades.
FAQ
What song from Wicked has the lyric “because I knew you”?
It’s “For Good,” the Act Two duet between Elphaba and Glinda. The full line is “Because I knew you, I have been changed for good.”
Who sang “For Good” originally?
Idina Menzel (Elphaba) and Kristin Chenoweth (Glinda) in the original 2003 Broadway production. Their version is on the Grammy-winning Original Broadway Cast Recording from Decca Broadway.
Is “For Good” in the first Wicked movie?
No. The 2024 film covers only Act One and ends with “Defying Gravity.” “For Good” appears in Wicked: For Good (2025), sung by Cynthia Erivo and Ariana Grande.
Who wrote “For Good”?
Stephen Schwartz wrote both music and lyrics. He has said he built the song from his daughter Jessica’s answer to what she would tell her best friend if they were parting forever.
Why is the second movie called Wicked: For Good?
The title comes directly from the song, which is the emotional climax of Act Two. It also plays on the same double meaning the lyric does: permanently, and for the better.
Is “For Good” a good song for a graduation or farewell?
It’s one of the most popular choices for exactly that. It’s about friendship rather than romance, the melody is manageable for amateur singers, and it’s honest about goodbyes without being gloomy.
