Re/code: Apple Music will certainly get its share of mainstream commercial promotion around Tuesday’s launch — the Cupertino tech giant has promised label execs as much. But a new, quiet social media campaign to tease Pharrell Williams’s latest project as a host on Apple Music’s Beats 1 livestreamed global radio station represents a subtle departure from the classic Apple launch playbook. The guerrilla marketing campaign to drive awareness of Apple’s new service is a sign that a company accustomed to controlling every part of the narrative around its products is open to different thinking.