You're not alone. The "music" combined with the visual sensory deprevation can be a trip. Some machines are completely featureless on the inside and I've found it can feel like I'm floating in a bit open space, not crammed into a magnetic tube!
The strong field can induce vertigo as well, it's pretty weird. You don't even need to be in the scanner- the field itself causes it by mucking with your inner ear.
