>>> (But then, so should identifying a CD by it's serial number, and 
>>> apparently that is a "solved problem".)
>>
>> What do you mean? Isn't the whole idea of a *serial* number that you 
>> can identify which one it is?
> 
> CDDB works by looking at track lengths and positions. I.e., the 
> information in the table of contents that says what sector each song 
> starts and stops on. Audio CDs for some reason don't have serial 
> numbers, UPC codes, lyrics, or cover art encoded on them, which seems 
> like rather a loss to me. (Even stranger to me is that MP3 doesn't 
> define that sort of thing either.)

MP3 defines ID3 for storing basic metadata about the track.

I gather the Ogg guys have a special format especially for storing 
lyrics... ;-)

-- 
http://blog.orphi.me.uk/
http://www.zazzle.com/MathematicalOrchid*

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