“Start Up A Rumour,” the latest single from producer-songwriter Sam Gellaitry, sounds like boogying in a Lite-Brite. The synth-heavy track is an effervescent bop — an immediate add to your summer dance playlist. But “Start Up A Rumour,” isn’t as pleasant as the breezy claps and Daft Punkian-swing might lead you to assume. The single hinges on quintessential summer melancholy that bubbles under the surface, reckoning with necessary relationship obstacles.