AAC- Advanced Audio Coding, compressed audio format, default on iTunes.
MP3- Moving Picture Exports Group Player, compressed audio format, most popular.
AIFF- Audio Interchange File Format, uncompressed audio format.
AAC file size: 6.6 MB
Higher MP3 file size: 4.9 MB
Good MP3 file size: 3.3 MB
AIFF file size: 35.4 MB
YouTube rip file size: 3.3MB
I could definitely hear a difference between the AIFF file, the YouTube rip and the "good" MP3 file. The AIFF was very clear and I could hear more of the subtle instruments in the song. The other versions sounded fuzzy compared to the AIFF file. I didn't hear a huge difference between the AAC file and the "higher" MP3 file.
If I was going to rip all of my CDs to my computer and trade them in I would probably use AAC or MP3 because of their decent quality,small file size and compatibility/uses with other sites.
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