DETROIT—At a gala ceremony in the heart of the city’s downtown, Detroit’s civic and business leaders unveiled a new half-ton, 400-horsepower Motown singer Thursday that promises safety, reliability, and soulful, unmistakable melodies. “This fully loaded 1,000-pound tenor with deep gospel roots is what Detroit does best,” said Alliance of Automobile Manufacturers president Mitch Bainwol, showing off the performer’s rugged, road-ready construction and rhythm section with optional funk features. “It’s a dual-exhaust harmonizing machine with full horn accompaniment and superior torque-handling ability guaranteed to churn out dazzling radio singles as well as the occasional politicized street anthem.” At press time, the hybrid-electric singer’s first attempts in the studio had been postponed until engineers can fix whatever is making that rattling noise.