AP Images Billionaire George Soros' firm made big bets on the music-streaming industry in the second quarter, according to regulatory filings. Soros Investment Management took stakes now worth $178.7 in newly-public Spotify and Pandora, the documents showed. Billionaire investor George Soros bet big on music-streaming platforms in the second quarter. His fund, Soros Fund Management, bought 728,700 shares of Spotify currently valued at $122.6 million in the second quarter, according to documents filed Tuesday.