Michael Schoch, Answers questions on Noodle
Here is a list of the dorms at Creighton University. Unfortunately, I couldn't find a residence hall reserved specifically for music majors. I did however, find this overview of the Music B.A. that describes the program's curriculum and affiliated student organizations.
Hopefully that's at least a little bit useful. If you want to find out what dorm halls music students traditionally congregate in, you could try calling the admissions department at (402) 280-2700.
Best of luck!