[ID3 Dev] Understanding multiple genres in ID3v23

Paul Taylor paul_t100 at fastmail.fm
Mon Apr 12 06:18:13 PDT 2010

With ID3v24 you can specify multiple genres by writing a null character 
between each genres, and I treat as multiple genres with equal 
precedence, unfortunately this is not how ID3v23 works.

 From the ID3v23 Spec:

"The 'Content type', which previously was stored as a one byte numeric 
value only, is now a numeric string. You may use one or several of the 
types as ID3v1.1 did or, since the category list would be impossible to 
maintain with accurate and up to date categories, define your own.

References to the ID3v1 genres can be made by, as first byte, enter "(" 
followed by a number from the genres list (appendix A) and ended with a 
")" character. This is optionally followed by a refinement, e.g. "(21)" 
or "(4)Eurodisco". Several references can be made in the same frame, 
e.g. "(51)(39)". If the refinement should begin with a "(" character it 
should be replaced with "((", e.g. "((I can figure out any genre)" or 
"(55)((I think...)". The following new content types is defined in ID3v2 
and is implemented in the same way as the numerig content types, e.g. 

So if you want to specify two genres and not use the numerical system, 
how do you separate them - with a space ?

i.e Rock Acapella

and if you do separate with a space, how do you specify genres which 
contain a space

i.e Rock Punk Rock Acapella

should be three genres, but would be read as four.

and are multiple genres read as refinements , or as genres of equal 

Or should we be putting these in brackets, I though brackets only 
applied to the predefined numeric types (plus RX and CV) but perhaps not.

In summary I dont expect there is a right anwser, but I would love to 
know whats others are doing, what is the defacto standard.


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