The kids were expected back at PS 22 on Wednesday.
The singing group is no ordinary school choir. They gained international fame from YouTube videos of their performances, and last year Anne Hathaway visited their school to surprise them and invite them to perform at the Oscars.
The group performed Sunday night wearing color-coded tees -- green for sopranos and blue for altos.
Published at 5:16 PM EST on Mar 1, 2011 | Updated at 5:30 PM EST on Mar 1, 2011