When Amsterdam’s Cubicolor recruited Duologue’s Tim Digby-Bell to sing on their 2015 single “Falling,” something clicked. The UK singer’s vulnerable voice proved the perfect fit for the Dutch duo’s bittersweet deep house, which until then had been all instrumental. On the following year’s Brainsugar, he came on board as a full-time vocalist, providing a melodic focal point for the group’s swirling layers of synths, piano, and muted guitars. He's even more integral on Hardly a Day, Hardly a Night: On “Wake Me Up,” his toplines take graceful piano harmonies somewhere entirely unexpected, and on “Now You Know,” hip-hop drums, sharper than usual for the group, carve out extra space for him to paint a stark picture of waning love. He can also be a spectral presence, even at the music’s center, fading like rays of afternoon sunlight as he disappears into vocoder and other effects. As a unit, Cubicolor has never sounded quite so diverse, taking in house, garage, indie pop, and even neoclassical ballads. The thread connecting it all? Its deep, abiding melancholy, perfectly expressed in Digby-Bell’s softly aching falsetto.