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When you import music files from a CD, iTunes encodes it as an MPEG-4 AAC file and places it in the Music Library. This format encodes CD-quality music at half the size of the original CD format. If you have a highly refined ear for music, set the iTunes “Importing” preferences to encode songs in “Apple Lossless” format. We encoded a 3-minute, 20-second song into both formats: the MP3 file encoded to 3.8 megabytes, the MPEG-4 file to 3.1 megabytes,Ī significant storage savings when you have a large library. The MPEG-4 AAC format compresses song files to a smaller size than the MP3 format without a noticeable quality difference.
