I like this discussion, as I have many issues yet to be completely resolved. Even though I'm a Windows user, I initially started out with iTunes. I've used many of the other apps mentioned, but iTunes seem to be the most consistently reliable, regarding tags. Elmer says "(the tags containing Title, Artist, Album, Genre, etc)", and most apps use these as the preferred tags, which are fine for popular music but are totally inadequate for Classical, where usually the Composer is the most important.
A program I've discovered for playing and organizing is MusicBee. Not only does it allow you to easily organize your files, it also allows conversion between formats which save the tags, editing the tags, sorting by whatever tag you want, etc. For very high quality (meaning better than CD), I've discovered a service called NativeDSD, which sells downloads at very high quality in DSD format (the lowest quality of which is what SACDs use). Many players can't play DSD files, but MusicBee can play them (and convert them to FLAC for use in other players).
No matter what software I use to rip the original CDs, the files all need their tags edited, but iTunes seems to get them right most often (for Classical, that is!).
One of the tags all systems seem to create is Date, but are ambiguous as to what date that is - in my opinion, it should be the performance date, but often the date which appears is the copyright date for the CD.
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CD burner software
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