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Big names in music back new Jay Z streaming service 'Tidal'

Hip hop musician-mogul Jay Z unveils his new streaming video company Tidal, with an all star line-up of investors on hand including Madonna, Rihanna, Nicki Minaj and Kanye West, and a read out by Alicia Keys of the company that aims to go head-to-head with competitors including Spotify and Apple's Beats. Rough Cut (no reporter narration).