The music industry has been promising music credits on the streaming services for more than a decade. They’re having another conference about it in Nashville this week, where some well-meaning people will once again discuss the nerdy, vexing challenge of “metadata.” To be fair, it’s not an easy problem, and the business can point to some progress. But in this special report, Craig Havighurst finds that in a world where public-facing databases can track 20 million UPS packages a day, baseball career statistics from 100 years ago to last night, and millions of global Bitcoin transactions, musician credits remain incomplete and hard to access. Left hurting are Nashville's working musicians, arrangers, producers and engineers who are trying to build resumes and reputation - and in some cases get paid.