While Spandau Ballet are often associated with the New Romantic movement of the early ‘80s, their legacy extends far beyond the sleek disco of tunes like 1983's “Pleasure.” “Once More” and “Love Is All,” both from 2009, enrich the group's suave sound with strings and acoustic guitars, and 2014's “This Is the Love” revisits the keening saxes of their sophisti-pop heyday and sounds as opulent as ever.