After the tragic shooting at Marjory Stoneman Douglas High in Parkland, Florida last year, students from the school founded a nonprofit advocacy organization and developed the instrument of hope.
The instrument is a trumpet constructed from bullet casings, and it's been touring the country since its creation.
Its latest stop was at the Broadway revival of Oklahoma!, where the production's musical director—Nathan Koci—played a version of "Out of My Dreams" after the show's matinee.
Watch the moving performance below:
The tribute touched many of the people who viewed it.
Thanks to Oklahoma! and the activists from Parkland for reminding us to remain hopeful.















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