Julie's Greenroom

When a burst pipe dashes Julie's plans for "The Wizard of Oz," Idina Menzel gives the Greenies a pep talk and inspires a wickedly good alternative.

The Greenies start working on the script for their mashup musical with help from Chris Colfer, who teaches them that words are important.

Josh Groban visits the theater for Julie's birthday and shows the Greenies how to sing from the heart -- and in perfect harmony.

When a disappointed Peri learns she'll be playing an ogre, Alec Baldwin reminds the Greenies that acting is all about pretending.

The Greenies hit the barre for a master class with married dancers Tiler Peck and Robert Fairchild, who've come to show them some ballet basics.

Sara Bareilles stops by to teach the Greenies how to make their own melodies. But combining music and lyrics takes serious teamwork.