CD-Quality Sound: 320kbps is the standard for high-quality MP3 files. It offers the closest experience to listening to a CD.
No Audio Artifacts: Lower bitrates often result in "swishy" or metallic sounds during complex parts of a song. 320kbps eliminates this, giving you clear highs and deep bass.
Better for Headphones: If you are listening on high-quality headphones or a car sound system, the difference between a low-quality rip and a 320kbps file is night and day.