He called it a “weird mish-mash of ideas.” But Joy’s “Riptide,” an insanely catchy ukulele tune that references dentists, a magician’s assistant and Michelle Pfeiffer, became a massive global hit. The Australian singer-songwriter, born James Keogh, saw his 2014 debut album, God Loves You When You’re Dancing, sell over two million copies, largely thanks to that one song. Now Joy, who Taylor Swift handpicked to open her 1989 Tour worldwide, has released his sophomore album. Once again, he focuses on intimate yet joyous songwriting. “Saturday Sun” comes closest to the infectious thrill of “Riptide.” The album’s most autobiographical song is “Little Boy,” which details a childhood accident, while “Call If You Need Me” and “Bonnie and Clyde” are both standout tracks. But, for sheer anthemic appeal, nothing matches the euphoria of “Lay It On Me,” with its robust, horn-driven chorus. Playing to his strengths, the wonder from Down Under has produced another winner.