john87,
I didn't say my CDs sound worse after twenty years, only that I have cassettes that still sound well.
I had my first Sony CDP-101 player in March 1983, my first discs came free, Journey, Elton John and Billy Joel. I sat with anticipation as Don't Stop Believin' from the Journey album Escape began. After all the pre-launch excitement I was horrified, it sounded awful. I followed it with Blue Eyes by Elton John, "Perfect Sound That Lasts Forever", not.
I tried other players, strange shapes and sizes, Philips, Marantz and Hitachi. They were almost as bad. Decided that I couldn't enjoy Compact Disc yet.
Almost twenty years later I am happy to say the same three discs from way back now sound terrific, the players are totally better as you might expect.
However, I can still enjoy cassettes recorded back then more than say, the latest Sheryl Crow album, C'mon, C'mon, based on sound quality alone, CDs are still not as good as quality analogue.
Maybe this is where SACD or DVD-Audio triumphs, but I don't care for the multi-channel remixes, I am a bit tired of Tubular Bells, but I remember it was originally a four channel possibility.
I have lots of 8 track cartridges too, anyone for "The Best Of Bread" in Quadraphonic, now that is better than cassette!