To reiterate what others have said: this is not the American "version" of Ouendan. They're different games; Ouendan was popular enough as an import title that iNiS decided to make an American game with the same basic premise.
But the songs are all different, the "stories" are different, etc. etc.
The song list, for those who are curious, is as follows (the songs are all covers, but they're generally very good covers. Youtube has a lot of gameplay videos if you're curious.):
1. Walkie Talkie Man - Steriogram
2. ABC - Jackson Five
3. Sk8er Boi - Avril Lavigne
4. I Was Born to Love You - Queen
5. Rock This Town - Stray Cats
6. Highway Star - Deep Purple
7. Y.M.C.A. - Village People
8. September - Earth, Wind and Fire
9. Canned Heat - Jamiroquai
10. Material Girl - Madonna
11. La La - Ashlee Simpson
12. You're the Inspiration - Chicago
13. Survivor - Destiny's Child
14. Without a Fight - Hoobastank
15. Believe - Cher
16. Let's Dance - David Bowie
17. Jumpin Jack Flash - Rolling Stones
18. Makes No Difference - Sum 41
19. The Anthem - Good Charlotte
Same basic layout as Ouendan - 4 difficulty levels, with the hardest having female cheerleaders ("agents") instead of male ones - but a different game. Also, in this one you can save your replays and broadcast them to other DS owners, and you can play multiplayer levels against your own saved replays, kind of like you can race "ghosts" in Mario Kart.