Young People's Concert: Let's Sing, Sing a Song - Sunday, April 15 at 2 p.m. - Sunday, April 15 at 2 p.m. - For nearly 50 years, Bob McGrath educated, entertained, and inspired generations of children from America’s most inviting neighborhood: Sesame Street. Mr. McGrath joins the Marine Chamber Orchestra, conducted by Capt. Ryan J. Nowlin, for a special concert of classic songs and sing-a-longs from his extraordinary musical and educational career as an original Sesame Street cast member. This 50-minute concert is best suited for kids ages 3-8, but all are welcome. After the performance, children are invited to try instruments in the musical petting zoo and meet Bob after the show for photos and autographs. The concert, which is free and open to the public, will take place in Northern Virginia Community College's Schlesinger Concert Hall in Alexandria, Va.