“Kumquat (Sunday Morning)” has what it takes to be a massive radio hit. The brand new track from Russian four-piece Mendream clings onto the realization of love, where a mere fling turns into something much more, and all of a sudden you’re sharing your first Sunday morning together. Beyond that, the music is utterly infectious — chock-full of tropical vibes and unbridled glee, the chiming guitar lead emitting an exotic glow as the youthfully airy vocals of Denis Mendreliouk take over. “This is our first Sunday morning together, and I don’t know if it’s the beginning or the end,” he sings during the anthemic chorus, the hesitation stymied by a melodic lead that evokes optimism and sun-filled beaches. Mendreliouk described “Kumquat (Sunday Morning)” as Mendream’s “new summer single” in the submission e-mail, and wow — this sure epitomizes a stellar summer single.