MIT requires a science core for every major at MIT, music, physics or architecture majors take the identical science core. It is one semester of biology, one semester of chemistry, a year of math and physics. All MIT students must take 8 humanities courses to graduate, and that is defined very broadly as anything in course 21 (English, history, foreign language, music ) , 14 (Economics ) , 17 (political science) and a few other majors, maybe urban planning?? . I know several MIT humanities majors, some doubled majored. One woman in my class got into Princeton for an English PhD. She is an English professor today. Another MIT grad I know majored in political science, and another in theatre studies.
A few pre law students at MIT study public policy and an engineering or science subject. Double majoring in public policy seemed to appeal to a number of my classmates.
I do not know if MIT will allow you to cross register at Mass Art and count those credits for your MIT degree. Call and ask them. Harvard, only if MIT does not offer the same subject. Harvard, you have to take the Mass Ave bus up there. Wellesley bus leaves every twenty minutes from MIT’s campus. There is a lot of cross registration with Wellesley and much less with Harvard. MIT/Harvard Health Sciences is a collaboration between those two colleges, largely at the PhD level though, for health related PhDs.
I knew many boys to go to Wellesley College for many of their 8 required humanities classes. Girls in my day went to Wellesley a lot less than boys did. I am not sure of the social dynamic surrounding Wellesley today.