This Australian singer racked up an impressive number of synchs with her self-titled 2008 debut, including placements in Coca-Cola and Old Navy spots and episodes of “The Hills” and “90210.” Three years later, Lenka seems well-positioned to reap similar rewards with “Two,” her unfailingly sunny follow-up. In bouncy, cleverly arranged tunes like “Heart Skips a Beat” and “Roll With the Punches” she exudes the kind of good-natured quirk that advertisers believe convinces consumers they’re buying from a friend, not a brand. The artist’s principal collaborator here is David Kosten, who’s produced freakier fare for Bat for Lashes. On “Two,” he emphasizes Lenka’s instinct for pop, as do English chart king Francis “Eg” White and Gnarls Barkley sideman Ben Allen. On the track “You Will Be Mine,” Guy Sigsworth positions Lenka’s voice in the same kind of percolating electro-folk soundscape he fashioned with Imogen Heap in their duo Frou Frou. But even then, her all-purpose geniality serves as the showpiece.