This Thursday, March 4th at 10am, The McGraw Hill Companies are sponsoring a Sound Playground in Carnegie Hall's Zankel Hall. Here's a synopsis of the program from Carnegie Hall's website: Join us in the "Sound Playground," where children discover and dabble in the exciting worlds of sound and musicmaking! Duo Mark Stewart and Rob Schwimmer of Polygraph Lounge, our "musical MacGyvers" can take anything—a baseball bat and a metal bowl, a bouncy ball and a rubber glove—and turn it into a musical instrument. Kids will experience traditional, classical, and zany instruments as they interact with and inspire these musical virtuosos in 45-minute concerts, held in Carnegie Hall's Zankel Hall. For tickets and complete information visit the event's site.