Jay Z aims to topple Spotify with music streaming service Tidal

Musicians including Beyonci(C) and Madonna show support for rapper as he overhauls service designed to make more money for artists

He has sold 100m records, founded a business empire worth upwards of $520m (350m) and married Beyonci(C). Now, Jay Z, backed by a roll call of A-list friends, is fronting the relaunch of a music streaming website heralded as the first real challenger to Spotify.

Kanye West, Rihanna, Coldplay, Madonna, Alicia Keys, Beyonci(C) and more threw their weight behind the rapper at a press conference last night where he unveiled the new look for Tidal, a streaming site originally launched by Norwegian firm Aspiro in October 2014 and acquired for $56m earlier this month by a company controlled by the music mogul.