@SamuraiK @Debbie S Keeping CDs is archaic as a primary format, but they're still useful to have as a backup. When my skaters compete we submit the electronic version and then keep a minimum of two back-up CDs on our person in case of some sort of error with the file (a corrupt version was uploaded, the wrong version was uploaded, the competition computer has an error). Heck, all competitive skaters I know have been trained in exactly what to do when the music goes bad: you head to the referee, find out the issue, and if needed bring them the backup CD your coach should have on their person.
I understand and encourage requiring all submissions to be electronic, but at the same time I think all competitions should have a CD player on hand in case of an error or computer malfunction. As great as computers and digital music players are, there's always a chance for problems. I've seen competitions as high as sectionals having issues with the music computer shutting down unexpectedly in the middle of competitions for an update, and there's been a not insignificant number of times I've seen practice ice sessions interrupted or filled with confused skaters because the coach uploaded the wrong music file.