hendrik on 30 Aug, 2010 07:12 AM
You can't (and it wouldn't necessarily make sense, since the color may change over time as your collection is changing)
I'm not sure what exactly you mean with "referenced". Can you please elaborate?
Colors are the result of a frequency analysis of a song projected into the color space specifically for your personal collection. That makes a legend impossible. However, sorting by color will give you an impression, what kind of songs in your collection are e.g. red.