Radio host, author, musician, actor and Playbill.com personality Seth Rudetsky presents Not Since High School, an Aug. 24 concert at 42West that will benefit the music program at MS 245, a New York City public middle school. Guests including Jessie Mueller, James Monroe Iglehart, Julia Murney, James Snyder and Sierra Boggess (she'll have Norm Lewis in tow to help her out) will perform the songs that made them stand out back in their school days. Here, Boggess rehearses a tune from Guys and Dolls and throws in her signature Lez Miz line for good effect. Watch Emily Skinner rehearse an unusual tune with Seth.