Tonight's <a href="/hashtag/supergirl?refid=13&__tn__=%2Cg"> <span > #</span><span >Supergirl</span></a> sets up the big musical crossover, but <a href="/hashtag/dctv?refid=13&__tn__=%2Cg"> <span > #</span><span >DCTV</span></a> Couch Club sings the blues over a big breakup. <a href="https://bit.ly/2nM8qvY" target="_blank"> <span> http://bit.ly/</span><wbr /><span ></span>2nM8qvY</a>