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Improvement
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Resolution: Unresolved
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Normal
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None
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None
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None
https://en.wikipedia.org/wiki/Compact_Disc_Digital_Audio
Audio CD should be labeled as CDDA, CD-DA or simply Audio CD and put under the CD more broad medium category (just as DVD-Video is under DVD).
Current medium types leads to releases being CD + DVD-Video (imho, it should be shown in release grups as CD+DVD or CD-Audio + DVD-Video or something like that.