Oh yeah, the music in the game is really freaking good. Some of the best music I've heard in a DS title. The DS isn't known for having the greatest sound chip, but Contact's audio milks it for all its worth.
I'm going to have to nominate Advance Wars DS for the best DS music. That I've heard in a DS game so far anyways. I also like Animal Crossing's soundtrack.
From most reviews I read, Contact got not so good ratings in the sound department.
I'd like to check this game out, but Children of Mana is just around the corner and I'm busy with Devil Summoner. :/