The nation's capital got in the holiday spirit Sunday night when music legends Neil Diamond and Mary J. Blige performed for President Barack Obama at the annual “Christmas in Washington” concert. The festivities, hosted by comedian George Lopez, took place at the National Building Museum and benefited the Children's National Medical Center. Diamond kicked off the concert by performing “Joy to the World” and “Winter Wonderland.” Blige wowed the crowd with “The Christmas Song (Chestnuts Roasting on an Open Fire).” Two of the holiday songs were original numbers. Country group Sugarland performed “Gold and Green” and Rob Thomas sang “A New York Christmas.” R and B singer Usher sang “Have Yourself a Merry Little Christmas” and Internet sensation Justin Bieber performed “Someday at Christmas.” After addressing the crowd, the Obamas stayed on stage with all the performers to sing carols, starting with “Hark, the Herald Angels Sing.” The president wiped a tear from his eye during the sing-along. The concert will air Dec. 20 on TNT.