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<p>Whoa, time out! Middlebury Language Schools (MLS) is a summer program of intensive language instruction. It’s open to applicants from anywhere, not just Middlebury College, and it has little relevance to the OP’s question.</p>
<p>Apart from MLS, Middlebury College is known for being very strong in foreign languages, and offers a broader array of languages than most LACs. But I don’t see a multi-language major listed among their major options.</p>
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<p>Probably because there’s not a lot of demand for it. I don’t know about the other schools you mention, but at Michigan it would be relatively easy to design your own major thought either the Bachelor in General Studies degree (BGS), or through the Individual Concentration Program (ICP). In either case you work with a faculty adviser to design your own curriculum. The BGS degree generally requires that you earn a standard 120 course credits toward graduation, with no more than 20 credits in any single department counting toward that total; and that at least 60 credits be in upper-level courses. But I should think five 4-credit courses in each of 3 languages, half of them at an advanced level, would easily satisfy that requirement. (And note that there’s nothing to stop you from taking even more courses in any language; they just can’t count toward your 120-unit graduation minimum). The ICP has even fewer rules: basically, you just need to come up with an interdisciplinary major and get it approved by the ICP adviser and ICP committee, and develop and execute an interdisciplinary senior project.</p>
<p>I believe quite a few colleges have similar kinds of “design your own major” options.</p>