(NOTE: I can only speak to the classical recordings that I own.) iTunes uses the Gracenote database for its CD track source. This accounts for some less-than-stellar identification when it comes to various titles, especially in the classical genre. For example, why the hell are some movement titles (think arias and choruses in vocal works) stuck in the album field, whereas the track field contains the album (i.e. work) name? It appears these errors are found in older recordings mainly, so that may be the issue right there, but all the same I sometimes find myself spending half an hour of my day correcting the track, album, and performer information for a recording.
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