JOSH ROUSE The pensive singer-songwriter strikes an upbeat tone on his latest effort     For Josh Rouse, family played an important role in the writing and recording of his 10th album, The Happiness Waltz. In 2006, Rouse moved from Nashville to Spain with his wife, and the couple now has a young child. He’s settled happily into fatherhood and married life, but his newfound responsibilities make for a delicate balancing act. “Before I was just...