You can't just take kids off the streets, put them in a hall, and expect them to know how to react.... During my first season, while I was conducting a youth concert, one kid went through a plate glass window and two bathrooms were totally destroyed...
As quoted in Rosenberg, Deena and Rosenberg, Bernard (1979). The Music Makers, New York: Columbia University Press, 1st ed., pg. 326, ISBN 0231039530.