The band Bella mentions in this Chapter is Linkin Park, and the CD is 'Hybrid Theory'. This was confirmed by Stephenie Meyer on her Frequently Asked Questions Page:
Q: What CD is Bella listening to in Chapter Seven?
Stephenie Meyer: I took that information out because I wasn't sure how long it was going to take to get Twilight published. If it took ten years, would the band still be cool, or would it be embarrassing? Lucky for me, it didn't take that long, and the band is still quite cool (in my eyes, at least). Bella is listening to Linkin Park. As I am at this very moment.