The short answer: hundreds of millions of dollars. The MLC has publicly acknowledged that a massive pool of mechanical royalties remains unmatched — meaning the money was generated by real streams, but the MLC can't identify the songwriters to pay.
Where does the unclaimed money go? After a statutory holding period, the MLC distributes unmatched royalties to publishers and self-administered songwriters based on their market share. In practice, this means the money flows disproportionately to major publishers (Sony, Universal, Warner) rather than the independent songwriters who actually earned it.
Why does this happen? Several reasons: songs registered with incomplete metadata, ISRCs that don't match between the streaming platform and the MLC database, songwriters who never registered at all, and the sheer complexity of matching millions of recordings to millions of compositions.
Is my money in there? If you've been releasing music on streaming platforms and haven't registered every song with the MLC, the answer is almost certainly yes. The average independent artist who runs their first audit on RoyaltyCoPilot.ai finds 3-7 registration issues, with estimated unclaimed royalties ranging from hundreds to tens of thousands of dollars.
What can I do about it? Step one: find out which of your songs are missing. RoyaltyCoPilot.ai checks your entire catalog against the MLC database in minutes. Step two: register the missing songs at portal.themlc.com. Step three: start collecting what you're owed.