The Boys Choir of Kenya performed; that's them in the group photo singing a hero's welcome song in Swahili in honor of Obama.
The two in the other photo are (right) Mitchell Mwamudo and (left) Frederick Masambaya. Many members of the choir, founded in 1998, come from slums in Nairobi. The choir effectively rescues kids from lives of poverty and, possibly, crime and drugs. This is their sixth trip to the United States; first time in Washington, although they've performed in Vermont!