Digital Muisc By Letterbox. Feb 17, 2003 Legal digital services There were 30. Feb 17, 2003 digital music sales first recorded Feb 17, 2003 Lisenced Tracks. 400, 000 Period: Feb 17, 2003 to Feb 17, 2010 Digital Music Feb 17, 2004 Perentage rise in didgital music sales Went up by 940 during 2004 and 2009 Feb 17, 2010 Legal digital services Over 400, Feb 17, 2010 Lisenced Tracks. 11, 00000