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A useful music catalog keeps compositions, sound recordings, and—if needed—the releases that package them as distinct but connected records. This matters because an ISWC identifies a musical work, while an ISRC identifies a sound recording or music video. Neither identifier substitutes for the other, and neither alone proves ownership.
The steps below work whether you are organizing songs you wrote, recordings you control, or a catalog that includes both. Start by defining what belongs in it, then record verified details, connect the records, and maintain a trail back to their sources.
1. Decide what your catalog covers
Before entering data, define the catalog’s boundary. A songwriter or publisher may focus on musical works and rights information. An artist, label, or recording owner may also need sound recordings, master-file locations, versions, and release details. If you need to track albums, singles, or editions, include releases as a third record type.
These are different objects, not alternate names for the same entry. The ISO description of ISWC distinguishes a musical work from a recording manifestation; the International ISRC Registration Authority’s guidance addresses recordings and music videos.
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2. Create separate, linked records
Give each work, recording, and release its own stable internal ID. Link related records rather than combining all details in one row: one work can be represented by multiple recordings, and a release can contain multiple recordings. This structure makes it possible to correct or update one item without confusing it with another.
Musical work record
- Identity: original title, plus alternate titles labeled as such.
- Creators: each composer, lyricist, arranger, translator, or other creator, with the person’s role. Record IPI identifiers where available.
- Work identifier: ISWC, if assigned. The ISWC authority’s allocation guidance requires complete metadata, including the original title and creator IPI name numbers and roles.
- Relationships: note related, derived, or version relationships so they are not mistaken for duplicate works.
- Rights information: record ownership shares, territory, effective dates, agreement references, and source documents as separately verified fields.
- Administration: add a status and the date the entry was last checked.
Sound recording record
- Identity and credits: recording title and artist or contributor credits.
- Recording identifier: ISRC, if assigned. The IFPI’s ISRC guidance says the first owner normally assigns the code and maintains reference metadata for it.
- Version: label distinct versions or mixes, such as an instrumental or radio edit.
- Release link: connect the recording to relevant releases and record the release date where known.
- Asset details: master-file name, format, duration, and secure storage location.
- Rights: record recording-rights information with its supporting documentation.
Release record, if you need one
Use a release record for album, single, or edition-level information and link the recordings it contains. Keep release data separate from work and recording identifiers so a new edition does not overwrite the identity or history of the underlying material.
3. Track rights separately from identifiers
An identifier helps distinguish and connect catalog information; it does not carry the whole rights picture. The ISWC authority says an ISWC does not convey ownership shares. Keep splits, territories, effective dates, agreements, and changes in separate fields supported by contracts or other appropriate source records.
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Professional exchange standards also treat rights information as part of structured metadata workflows. DDEX’s Musical Works Data and Rights Communication standard covers work-rights communication, while its Recording Data and Rights standards cover recording-related data and rights. Exchanged data is useful, but it does not replace checking the underlying documents.
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4. Mark uncertainty instead of guessing
For consequential fields, keep the source and the date you checked it. If a split, identifier, date, or rights claim is unclear, leave it unresolved rather than filling in a plausible value. Use a consistent status such as confirmed, needs verification, disputed, or not applicable.
When sources conflict, retain the original values and note where each came from. That preserves the evidence needed to investigate a mismatch instead of silently erasing it.
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5. Find or assign identifiers through the right channel
- For a work, gather complete title and creator details, including roles and IPI name numbers where available, then use the relevant ISWC registration agency or allocation service. The ISWC authority describes allocation and registration agencies.
- For a recording, follow the applicable ISRC registration guidance. The International ISRC Registration Authority says assignment normally takes place with the recording’s first owner.
- Record the result and its source in the corresponding work or recording entry. Do not place an ISWC in an ISRC field or treat either code as proof of ownership or permission.
6. Choose a catalog tool that fits
A spreadsheet can be a practical starting point for a small catalog if works and recordings have separate tabs or tables, stable internal IDs, validation rules, source links, and backups. A database or catalog-management system may suit a larger or collaborative operation. No universal product or catalog-size threshold is established by the standards cited here.
Compare tools against the work you actually need them to do:
- Can they keep works, recordings, and releases distinct while linking them?
- Do they support external identifiers, rights fields, version tracking, and file locations?
- Can you export your data in a useful format?
- Do access controls fit the people who need to view or edit the catalog?
- Are backups available, and can you restore data if it is lost or changed incorrectly?
Audio files and catalog backups may be stored on external drives or other storage, but one drive alone is not a complete backup strategy. Choose a backup arrangement that preserves both the catalog data and the source files it references.
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7. Reconcile entries and keep them current
Check catalog records against contracts, registration records, distributor data, and the master files. Investigate duplicate entries and title or credit conflicts without deleting the original source values. Record changes in a dated log and keep more than one backup copy.
8. Apply rules in the right territory and context
ISWC is an international identifier, but registration and rights administration involve registration agencies and organizations. DDEX describes typical exchanges among digital music services, record companies and distributors, rights owners or administrators, and collective organizations.
The U.S. Copyright Office regulations in 37 CFR §§ 210.10, 210.27, and 210.31 identify metadata categories—including ISRC, ISWC, creator and ownership information, and catalog numbers—in defined U.S. reporting contexts. They are not a worldwide legal checklist; confirm the rules and contracts that apply to your territory and role.
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