West African-inflected guitars, intricate three-part vocal harmonies and a fearless intellectual and compositional ambition all serve as useful signifiers with which to describe Dirty Projectors’ music. But it is the space between these elements, where melody and drama unfold among ascending voices and the intuitive and counterintuitive meet, that the essence of the band is located. David Longstreth’s singular talents have led to all manner of invitations from the great and the good but have left his restlessness undimmed.