Sony Music Group, the world’s largest music publisher, has warned companies like Google, Microsoft, and OpenAI, among others, about the unauthorized use of its music to train AI systems.  Representing a myriad of iconic artists such as Beyonce and Adele, Sony Music demanded compliance with copyright laws from over 700 companies that might have used its songs without permission. In a letter seen by Bloomberg but not made publicly available, Sony Music expressed that its music might have been used without authorization.  The letter states, “We have reason to believe that you may already have made unauthorized uses of our…