I wonder if the music industry's embrace of the Apple Music store was due to them realizing MP3s could be another lucrative (to them) format shift for customers. Music fans have gone from LPs to 8-tracks to cassettes to CDs, and now to MP3. Electronically-distributed music is semi-permanent at best (what do you do when a hard drive fails? Will you be able to play the tracks three years from now?) and there is plenty of past precedence to show how much the movie and music industry love selling easily destructible formats to consumers, who often have to re-purchase the music later on.