While these are basically optional, filling them in can be particularly useful for organizing and sorting your music further. You’ll notice that a smattering of other tags are also available here. Users concerned about retaining tags in lossless files are probably better to consider the AIFF or Apple Lossless formats. Keep in mind that some formats, such as WAV files, do not provide any fields to store tag information in this case the information for these files will only be stored within the iTunes database and this information will not be available when importing these files into another iTunes library or another application. This means that if you reimport these files into another iTunes library or another media management application that reads tag information, any changes you’ve made will be reflected there as well. When you make a change to the tag information in iTunes, this information is updated both in the iTunes database and in the file. Note that tag information is stored both in the iTunes library database and within your actual media files, providing the file format supports tag information. Further, even with your purchased and CD-imported content, you may not like the way the information is filled in and may prefer to customize it to your own liking.

On the other hand, media content that you import from other sources may not be filled in completely or properly. Tracks you purchase from the iTunes Store and other online stores and tracks that you import from your own CDs will normally include at least basic tag information. Of course, for this to work properly, the necessary tag information needs to have been filled in.

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