Reversion clause
A contractual provision in a publishing agreement that allows copyright ownership of specific works to revert to the songwriter after a defined period of time or upon the fulfillment of certain conditions — for example, if the publisher fails to commercially exploit the work within a specified timeframe.
Articles about Reversion clause

Copyright Chain of Title in Music: How to Establish and Verify Ownership
Proving who actually owns a song or master is rarely straightforward; missing split sheets, conflicting society entries, and legacy transfers create real operational risk. This guide lays out a step-by-step approach to build and verify a reliable copyright chain of title for both compositions and sound recordings, listing the exact documents, registry checks, APIs, and red flags you should use.

Sync License Agreements Explained: What Musicians and Filmmakers Need to Know
A sync license agreement is the legal permission to put a musical composition to picture, and in practice it is often conflated with the separate master use license that covers the recorded performance. This technical guide breaks down which rights must be cleared, the contract clauses and negotiation levers that matter, how sync fees and downstream royalties flow, and the metadata and cue-sheet practices that prevent missed payments.