International Standard Musical Work Code
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An International Standard Musical Work Code (ISWC) is used to uniquely identify a musical composition. It is an official standard (ISO 15707).
An ISWC consists of the letter T followed by nine digits (in three groups of three) and then a check digit, like T-034.524.680-1.
The first ISWC ever issued was for the song "Dancing Queen" by ABBA, which got ISWC T-000.000.001-0.
These codes are for works (such as songs and symphonies); specific recordings of them should have International Standard Recording Codes.
