In honor of the 15th anniversary of Wicked on Broadway, Frozen stars Caissie Levy and Patti Murin decided to revisit Oz for a rendition of the show’s final ballad “For Good,” accompanied by Frozen music director Brian Usifer.

Levy and Murin can currently be seen as sisters Elsa and Anna, respectively, in the Broadway stage adaptation of Disney’s Frozen, but both have also starred in Wicked.

Known for her signature belt, before her days as Elsa (originally voiced in the animated feature by Broadway’s original Elphaba, Idina Menzel), Levy played Elphaba in the 2008 Los Angeles production of the musical, having understudied the role on Broadway. Murin joined the first national tour of Wicked, playing Glinda from 2012–2013.

Although they never played the witches alongside each other, now audiences can hear what their Glinda/Elphie pairing would have been in the video below: