🎼 Validators

ISMN Validator

Validate an ISMN (International Standard Music Number), the code for sheet music and printed music, by its check digit. Useful for publishers and music libraries.

Input

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ISMN: the ISBN of sheet music

Printed sheet music does not use an ISBN — it uses an ISMN, an identifier of its own created in 1993 precisely because printed music has cataloguing needs a book does not. Since 2008 it lives inside the EAN-13 code space, with the 979-0 prefix reserved for it alone, which let bookshops and distributors handle sheet music with the same equipment as everything else.

Paste the number, with or without hyphens, and the page validates it. It accepts both forms in circulation: the thirteen-digit one beginning 979-0, and the older one beginning with the letter M followed by nine digits — the latter is converted internally, because M corresponds exactly to the 979-0 prefix. The check digit is recomputed and compared against the one supplied.

The check digit arithmetic is EAN-13's: multiply each of the first twelve digits alternately by 1 and by 3, sum them, and the check digit is whatever reaches the next multiple of ten. That is why a single mistyped digit is nearly always caught, while swapping two adjacent digits that differ by five slips through — a known limitation of this kind of check digit.

Frequently asked questions

How does it differ from an ISBN?

The ISMN identifies notated music — a full score, an orchestral part, a piano reduction. The ISBN identifies books, including books about music. A publication carrying both text and score may receive both. The prefixes are distinct: 979-0 for ISMN, 978 and 979-8 for ISBN.

Why does the M form exist?

Because it was the original form, predating integration with EAN-13. The letter M was chosen for evoking music and for occupying a slot the old system had free. After 2008 it became merely an alternative spelling of the 979-0 prefix, and validation has to accept both.

Does every arrangement need its own number?

It does, and so does every format. The same work as a full score, as separate parts and as a piano reduction gets three numbers. The rule matches the ISBN's: a distinct identifier for each product a buyer might want to tell apart.

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