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Something like ISO 639, we need a list and codes for the musical instruments. All MIDI instruments will be added to the list for treating as the single instruments.

For the code zz???, the last three letters would be used for the lyric based on the real language tags in ISO 639-3, and the following codes should follow the language-script rules, e.g. the lyric of one song is recorded by Chinese Cantonese dialect used in Guangzhou, and the code should be zzyue-Hans-CN-GD-CAN, so we can also treat zz as the escape or shift characters.

ISO 15924 only include the script information for writing system. All the characters (symbols and control characters included) must be encoded in UCS or Unicode for the common use, so we also need a list to record the musical notation types.

In UCD of Unicode, the script of the almost all the characters used for the musical notations are chosen as common, and the corresponding code is Zyyy. The type codes used here will be not duplicate with the ones in ISO 15924.