Lea Michele Gets Emotional Rehearsing for the 'Spring Awakening' Reunion (Watch)

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came back together for a one-night-only concert to benefit the Actors Fund. And the entire reunion was documented for the upcoming HBO film,, which features all-new, revealing interviews with stars Lea Michele, Jonathan Groff and John Gallagher Jr.

and captures what it was like to reconnect during an unlikely time for everyone. Ahead of the film’s debut on May 3, only ET has an exclusive preview of the emotional reunion as Michele rehearses her character, Wendla’s, opening solo number, “Mama Who Bore Me.” “We have three rehearsal days and then we’re gonna perform it on stage, so I’m scared,” she says in the clip. “I told Jonathan I haven’t been that nervous or anxious since the day my son was born.”Michele adds, “It was a tsunami of emotions.” “Watching her sing that song, I was like, ‘Oh my god.

I saw this 19-year-old memory and just lost my mind,’” says Groff, who is overcome with feelings during the rehearsal. The clip only offers a tiny glimpse into the deep bond that formed between Michele and Groff, who starred in the 2006, Tony Award-winning coming-of-age rock musical from musician Duncan Sheik and lyricist Steven Sater.

Both actors originated the roles alongside Gallagher and the rest of the ensemble of young actors, including Lauren Pritchard, Jonathan B.