A group of performers broke into song in the crowded street outside New York's Carnegie Hall after Saturday evening's show was canceled due to a massive power outage that shut down Manhattan.

Several videos posted to social media showed a choir outside the venue singing to a large crowd of onlookers.

One onlooker told INSIDER that she was looking for a viable train and stumbled upon what she described as a "celestial sound."

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A choir scheduled to perform Saturday night at Carnegie Hall made the best of their canceled show amid a massive power outage that plunged a large chunk of Manhattan into darkness.

Author and professor Briallen Hopper tweeted that she was stuck on a train for nearly an hour before going above ground to find darkened restaurants and buildings. Hopper told INSIDER she was in the midst of forming a backup plan to catch a train when she followed what she described as a "celestial sound."

"All the trains at 63rd were down so I decided to walk to 57th to see if any trains were running there," Hopper said, referencing a station in the approximately 20-block radius that experienced outages. "Then I heard this celestial sound and I walked toward it."

Read more: 40,000 people lost power in New York City power outage that knocked out train stations, elevators, and traffic lights amid transformer fire

One user said it was the Millennial Choirs & Orchestras, which was the group scheduled for an 8:30 p.m. show before the venue announced the evening's shows were canceled.

Read more: Here's what it's like behind the scenes at NYC's Carnegie Hall, the 128-year-old concert venue that's hosted Duke Ellington, Tchaikovsky, and the Beatles

Another user who saw the performance from above wrote that the makeshift performance was "what turning lemons into lemonade is all about."

The rest of the city wasn't as lucky, as more than 40,000 were experiencing power outages around 8 p.m. Saturday, leaving residents stranded on trains, in elevators, and without traffic lights.

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