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while listenin to my shag times cd it appears the last 4 tracks don't like to play anymore

As Don was saying, yes this sounds like disc rot with PDO discs. However, there is a version of the "Shag Times" CD which is "Made in Switzerland" (it says so on the sleeve) and does NOT suffer from disc rot. I think it was a re-issue from 1991, but no one seems sure. If you can get hold of a copy of the Swiss "Shag Times" CD, it shouldn't skip. John