Media Metrix reports that there were an estimated four million users of digital music, including MP3 formatted files, in US households in the month of June 1999. This is up from just a few hundred thousand less than a year ago. The leading digital music players in June 1999 were RealNetworks RealJukebox at 2.2 million users and NullSoft Winamp at 1.8 million users. Media Metrix estimates there were approximately 50,000 users of other brands of digital music players in the month of June 1999.

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