'Song of Parkland' brings life-affirming touch to tragedy

Hard as it is to believe, Valentine's Day will mark the one-year anniversary of the mass shooting at Marjory Stoneman Douglas High School, which birthed a teen-led gun-control crusade. HBO marks that moment through a narrow window into it with "Song of Parkland," a half-hour documentary short that's equal parts uplifting and heartbreaking.

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