How many of you out there remember holding a microphone up to the speaker and recording the radio onto a cassette tape? I do.
In 1983, cassettes tapes accounted for 47.8% of music sales; vinyl 44.6%. The jump in casette sales was a result of the debut of the Sony Walkman in the early '80s. Although CDs overtook cassettes in 1991, their sales peaked barely a decade later in 2003. Downloads overtook CDs in 2012.
In 2013, CDs accounted for 30.4% of all music sales. Downloads, meanwhile, accounted for 40% (singles, 22.4%; albums, 17.6%) Sales of ringtones peaked at 11% in 2008.
iTunes was released in January 2001; the iTunes Store in April 2003. The first iPhone was released in 2007.