'The Flash,' 'Empire,' 'DWTS,' 'The Voice': This week
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This week there will be singing (“The Voice,” “Empire”), dancing (“Dancing With the Stars”) and singing and dancing (“The Flash”). Yes, “The Flash” offers a musical episode that lets the title character (Grant Gustin) and Supergirl (Melissa Benoist) show their hoofing skills at 8 p.m. Tuesday on...

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