Reliable Source: Esperanza Spalding performs Gitmo protest song at Lincoln Theatre

Celeb: Esperanza Spalding, the genre-defying vocalist and bass player, who performed at the White House in 2009 and won a Grammy for "Best New Artist" in 2011. Cause: On Wednesday Spalding joined with top brass from the Center for Constitutional Rights, Human Rights Watch, Amnesty International and the ACLU to host a free concert that included a policy-drenched panel discussion about the prisoners currently held at the Guantanamo Bay Naval Base.