The effects of the powerful strategy are not just emotional. They're also practical. Last week at Delaney Hall in Newark, New Jersey, protesters sang at police during a sit-in. It was just months after the Resistance Revival Chorus packed 500 people into Middle Church in Manhattan’s East Village for an ICE Out sing-in. At that event back in February, 150 people who couldn’t get inside stayed on the sidewalk, singing along from printed lyric sheets. Neighbors filed out of their apartments to