to offer subscription-based "pay to stream" services over the Internet. With streaming services, the user pays a subscription to a company for the right to listen to songs and other media from a library. Whereas with legal digital download services, the purchaser owns a digital copy of the song (which they can keep on their computer or on a digital media player), with streaming services, the user never downloads the song file or owns the song file. The subscriber can only listen to the song for as long as they continue to pay the streaming subscription. Once the user stops paying the subscription, they cannot listen to audio from the company's repositories anymore. Streaming services began to have a serious impact on the industry in 2014. Spotify, together with the music-streaming industry in general, faces some criticism from artists claiming they are not being fairly compensated for their work as downloaded-music sales decline and music-streaming increases. Unlike physical or download sales, which pay a fixed price per song or album, Spotify pays artists based on their "market share" (the number of streams for their songs as a proportion of total songs streamed on the service). Spotify distributes approximately 70% to rights-holders, who will then pay artists based on their agreements. The variable, and (some say) inadequate nature of this compensation, has led to criticism. Spotify reports paying on average US$0.006 to US$0.008 per stream. In response to concerns, Spotify claims that they are benefiting the music business by migrating "them away from piracy and less monetized platforms and allowing them to generate far greater royalties than before" by encouraging users to use their paid service. The Recording Industry Association of America (RIAA) revealed in its 2015 earnings report that streaming services were responsible for 34.3 percent of the year's U.S. recorded-music-industry revenue, growing 29 percent from the previous year and becoming the largest source of income, pulling in around $2.4 billion. US streaming revenue grew 57 percent to $1.6 billion in the first half of 2016 and accounted for almost half of industry sales. This contrasts with the $14.6 billion in revenue that was received in 1999 by the U.S. music industry from the sale of CDs. The turmoil in the recorded-music industry in the 2000s altered the twentieth-century balance between artists, record companies, promoters, retail music-stores and consumers. , big-box stores such as Wal-Mart and Best Buy sell more