The notation on the album artwork might have occurred because the album artwork was prepared at a later date, when they knew which version would be appearing in the film, but too late to change the disc selections.
In other cases, the album producer might not mention it because it might not be necessary to... most of the takes used on the original Fellowship of the Ring CD are different from those appearing in the films and on the Complete Recordings, but making such a notation would be distracting given that the differences tend to be minor.
Don't forget, many classic film score albums, including most of the work of Henry Mancini, Elmer Bernstein's The Ten Commandments, Franz Waxman's Taras Bulba, John Williams' Dracula, Ernest Gold's It's A Mad, Mad, Mad, Mad World and many others are completely different recordings that what appear in the film.
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In other cases, the album producer might not mention it because it might not be necessary to... most of the takes used on the original Fellowship of the Ring CD are different from those appearing in the films and on the Complete Recordings, but making such a notation would be distracting given that the differences tend to be minor.
Don't forget, many classic film score albums, including most of the work of Henry Mancini, Elmer Bernstein's The Ten Commandments, Franz Waxman's Taras Bulba, John Williams' Dracula, Ernest Gold's It's A Mad, Mad, Mad, Mad World and many others are completely different recordings that what appear in the film.