Album: Sweet 19 Blues

Released: 1996
Total Tracks: 19
Genre: J-Pop
Album: Concentration 20

Released: 1997
Total Tracks: 12
Genre: J-Pop
Album: 181920 (Partial Album)
1

Released: 1998
Total Tracks: 9
Genre: J-Pop
Album: Break the Rules (Partial Album)
2

Released: 2000
Total Tracks: 13
Genre: J-Pop
Album: Style (Partial Album)
3

Released: 2003
Total Tracks: 7
Genre: J-Pop
Album: Queen of Hip-Pop (Partial Album)
4

Released: 2005
Total Tracks: 11
Genre: J-Pop
Album: Play

Released: 2007
Total Tracks: 12
Genre: J-Pop
1 Original album has 12 tracks. Missing from the iTunes version is Track 2 "Try Me ~ Watashi o Shinjite," Track 4 "Taiyou no Season," and Track 9 "Stop the Music."
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2 Original album has 14 tracks. Missing from the iTunes version is Track 1 "Rule 8AM, a 30-second instrumental. So, yeah, you may not be missing anything by buying this version.
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3 Original album has 15 tracks. The iTunes version has 7 so it can hardly be called the same album and it's quite a shame as it's a really good album — i.e. in its entirety.
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4 Original album has 12 tracks. Missing from the iTunes version is Track 9 "I Love You."
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Namie Amuro (Wikipedia)