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By James Vincent When you're trying to get some attention for a new product, it helps to have friends in high places. Jay Z apparently knows this, and has recruited an all-star team of musicians-turned-PR-flacks to promote the relaunch of his recently-purchased music streaming service Tidal. Madonna, Kanye West, Deadmau5, and Beyoncé are among the well-known names tweeting promotional messages for Tidal, with the artists all using the same ‪#‎TIDALforALL‬ hashtag and changing their profile pictures to display the streaming service's signature color: a striking shade of cyan.