On May 1, the major will switch to a digital e-card system for the distribution of promotional music. Sony already uses this digital system for many releases but Sony UK chairman and CEO Ged Doherty reveals that the major will be phasing out the mailing of physical stock at the same time.

"Digital promo is set to become an industry standard as other major and independent music companies also make the switch," Doherty writes in an email to contacts.

"Physical ...