Watch GMA's Massive Nationwide 'Let It Go' Sing-Along

02/26/2014 at 12:00 PM EST

Idina Menzel is set to perform "Let It Go" at the Oscars, and she got the practice of her life Wednesday morning, singing the Frozen showstopper on Good Morning America as part of a massive nationwide sing-along.

After Menzel kicked things off in Times Square, the Broadway star turned the song over to a trio of costumed Frozen fans, clad in full Elsa attire. Soon the entire New York City crowd – anchors George Stephanopoulos, Ginger Zee and Laura Spencer, singing along with hundreds of spectators – got in on the fun.

The sing-along continued with a mixture of live and pre-taped clips from across the country, including zookeeper Jack Hanna (singing to a penguin), the Muppets and 9-year-old Annelise Forbes, whose rendition of "Let It Go" stunned us in January.

"I can understand how girls are gravitating to this song," Menzel told ABC News.

"It's about owning your own power. It's about owning who you are and celebrating what makes you a fierce young girl and not caring what people think and finally relinquishing and being free."

ABC is owned by Disney, the studio that produced Frozen.

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