Apple’s iTunes store accounted for 28% of all music purchased in the United States in the first quarter. Amazon sells CDs, as well as downloadable tunes in MP3 format, giving it a stronger position among music lovers. Wal-Mart led in U.S. CD sales with 17% of the retail market; Best Buy was second with 14%, followed by Amazon, 11%. But CD sales in stores continue to decline, as people find a much better selection online, research firm says.”]
Source: https://www.darkreading.com/database-security/amazon-ties-wal-mart-in-online-music-share