Music majors are the most likely group of college grads to be accepted to medical school!!! (I'm one of them). Many studies have reflected this.
Many non-science majors outperform their science major peers when it comes to the MCAT, USMLE, COMLEX, etc... as pointed out by a previous poster.
I must repeat what people have been saying so far. DO SOMETHING YOU ENJOY and if possible, something that could potentially be a job in case medical school doesn't work out for you. A lot of things can happen in 4 years....DO NOT pick a major based on passing the MCAT. That is just silly. Just make sure you have the pre-reqs and study like mad for the MCAT when the time comes. By the time you take it, the test won't be so "hard science" heavy anyway. So, enjoy studying your liberal arts!