
ITunes 4 already had the ability to import audio from a CD, convert audio to compressed, compact AAC or MP3 audio, burn music to CDs, and load files onto the iPod, but the best new feature in iTunes 4.5 is probably the new Apple Lossless encoder. Arguably designed with the iTunes Music Store in mind, the Apple Lossless Codec is a compromise between the small but lossy encoding of AAC or MP3 and the large file sizes of pristine AIFF audio. Apple Lossless provides full uncompressed CD quality audio in about half the space of the original file, answering the call by discriminating musical ears for a format that offered both compression and high-quality audio. Let's see the Apple Lossless encoder at work on a CD track.