Since Sonic Adventure 1 was such a huge deal, there were several CDs released to celebrate. This one is "Songs with Attitude" a vocal mini album. They selected each vocal track that is a character theme and released it as a short 6 song CD. (The last one is just the game's main theme, not any specific character)

Disc One (27:20)
1) It Doesn't Matter ...Theme of Sonic 4:28
2) My Sweet Passion ...Theme Amy 5:10
3) Lazy Days ~Livin' in Paradise~ ...Theme of Big 4:03
4) Believe in Myself ...Theme of "Miles" 3:53
5) Unknown from M.E. ...Theme of Knuckles 4:31
6) Open Your Heart ...Main Theme of "Sonic Adventure" 5:15