> What does it do if you play something that isn't in the database? (I.e., 
> you pick up an instrument and play something yourself.)

I tried whistling a song to it once, I just got a text back saying it 
couldn't recognise the song :-( grrrrr

>> What do you mean? Isn't the whole idea of a *serial* number that you can 
>> identify which one it is?
>
> Yes - but if you aren't the manufacturer, it's just a useless number to 
> you. The only reason this is usable is that somebody sat down and somehow 
> built a giant database containing all the serial numbers and the matching 
> metadata; AFAIK, the manufacturers didn't hand this data over, some poor 
> sod collected it.

Or rather, multiple poor sods collected it :-)

http://en.wikipedia.org/wiki/CDDB#History

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