Google Music may depend on an online-based locker, not subscriptions, as the cornerstone of its service, insiders said today. Label contacts said Google's initial proposal would charge a flat $25 per year to put any music a customer owns in cloud storage that they could then stream or download. Billboard understood that it would cross-check a user's library and give them access to any song Google would have a license to sell, even if it was a CD rip or bought from a competitor like iTunes.