The last mile is where records get lost

Delivery is the stage with the least glamour, the most rules, and the highest concentration of errors that cannot be fixed after the fact.

What actually goes wrong

Wrong sample rate. Wrong bit depth. Missing ISRC. Metadata written into the file but not the distributor's form. A file name with a character the ingest system rejects. Masters uploaded from the wrong folder, which is the one that ships.

None of these are difficult. All of them happen, because delivery comes at the end of a long project when everyone is tired and wants to be finished.

Build a checklist once and run it every time, including the times you are certain you do not need it.

The checklist

This is a reasonable starting point. Adapt it, but do not shorten it on the grounds that you would obviously never make that mistake — the whole category of error here is made by people who would obviously never make it.

• Play every master end to end, from the folder you are about to upload. Not from the session, not from the render window. The folder.
• Confirm sample rate and bit depth on every file, individually. One file at the wrong rate is the classic.
• Check true peak on every file. Under minus one dBTP, measured after the last process.
• Check integrated loudness across the set and look at the spread, not the values.
• Check the top and tail of every file. No clicks, no truncated tails, consistent silence at the head.
• Check the running order and the track times against the release sheet.
• Check spelling of every title, every credit, every name. Then have someone else check it.
• Confirm ISRCs are assigned, unique, and entered in the distributor's form as well as the files.
• Confirm the artwork meets the spec — dimensions, colour space, file size, no text that will be cropped.

Metadata lives in two places and people only fill in one

Embedded metadata in the file and the metadata in the distributor's web form are separate. The distributor's form is usually what reaches the platforms; the embedded tags are what everybody else sees when the file is opened by a human.

Fill in both, and make them agree. Disagreement is how you end up with a release where the streaming page and the WAV that went to radio credit different producers.

ISRC deserves its own mention because it is the one nobody can fix later. It is the identifier royalties are tracked against. A missing or duplicated code means plays that are not attributed, and untangling that after release is slow and sometimes impossible.

Folder discipline

Most delivery disasters are not technical. Somebody uploaded the right-sounding file from the wrong folder.

One folder per release, named with the artist, title and date. Inside it, one folder called MASTERS containing only the final approved files and nothing else — no alternates, no earlier versions, no bounce with v3 in the name. Every other version goes somewhere else entirely, ideally in a folder whose name begins with a character that sorts it away from the masters.

If there is more than one candidate file in the masters folder, the system has already failed and it is only a matter of time.

Deliver early enough to fix something

Distributors have lead times, and platforms take days to process. Delivering at the deadline means any error found in ingest is an error you cannot fix before release.

Build in a week. It costs nothing and it converts the entire category of delivery error from catastrophic to annoying, which is the only realistic goal here.

The checklist does not exist because you are careless. It exists because the last day of a project is the worst day to rely on being careful.