For nearly 40 years, Ziggy Marley has built a legendary career across music, writing and philanthropy. Now, the eldest son of reggae icon Bob Marley returns with Brightside, his ninth studio album, which was produced entirely by him and his brother Stephen. He chats with Q’s Tom Power about what happens when he records with instruments tuned to a lower frequency, the spiritual place he seeks out when he makes music, and the first song he ever dedicated to his late father.