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Some (note I said "some") music CDs have "higher" quality than "regular" data CDs. Remember when CDs used to have a dark blue/purple colored layer for writing? The green used nowadays is not as reflective or longlasting as the old blue/purple ones (although the green ones still last for a very long time). Some music CDs still use the blue/purple dye and what not. The gold color is the longest lasting, lasting about twice as long as CDs with blue dyes.
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