Yes, you can rip your music CDs to the XBox hard drive. It doesn't work in all games, but it does work in Project Gotham 1 and 2, Tiger Woods, Apex, and others. If it does, it will give you the option to set up your own tracks in the options of the game you are playing.
"The large print giveth, and the small print taketh away." - Tom Waits
Athlon XP 2100+ | 512MB PC3200 RAM | Asus A7N8X Deluxe | GeforceFX 5900 VIVO 128MB @ 475/950 | 2 Western Digital SATA 120GB HDD in RAID 0 | 1 IBM 60GXP 60GB HDD IDE | 36x 12x 48x CD-RW | Logitech Z-680 THX 5.1 Speakers | 19in. Samsung 955DF Monitor | Windows XP Pro