<p>You can do it-- but you have to really want it. It will mean that aside from language and gen eds the rest of your courses will be in both fields–more or less. Harvard prefers that a student have a concentration and a secondary (minor) but in most cases will go along…my S is doing a joint music and mathematics concentration and had to convince both departments (and had to produce a dummy course schedule for the next 3 years (he is a rising sophomore)). It wasn’t easy-- esp to get music to agree-- math was easier because Noam Elkies the present chair of Math is also a composer so he thought it was GREAT.<br>
Like most things at Harvard, if you are persistent and can make a credible case, most (but not all of the time–a freshman who wants to do 5 or 6 courses will be told NO by his or her advisor, but as you get further along in the College, they are more willing to listen…) of the time the College will let you do want you would like (they have a “it’s your funeral…” approach) . But you may have to get past the initial “no” (maybe even several "no"s) to demonstrate that you are serious.</p>