<p>Perhaps one math or science, one spanish and Music as the extra letter</p>
<p>From the Brown Alumni site:</p>
<p>Extra recommendations
In general, one extra recommendation above and beyond your primary letters is fine, but it should meet a fairly high standard: 1) it should be very strong; 2) it should give the reader information about you that is not otherwise available in your file; and 3) it should not be from a source that the admission reader will regard as inherently biased (family member, caregiver, family friend) or irrelevant (someone of importance who doesn’t actually know you). For example, it might come from a mentor, a coach, or an employer who knows you extremely well and can speak to strengths or qualities you display outside the classroom. Or it could be from a teacher in a third area that really should be represented. Just be sure that a third recommendation is truly justified, or you run the risk of annoying the already-overloaded admission reader. Call us if you can’t decide which way to go on this.</p>