Non-science prof LOR

[Nontrad_FL_LGBT]

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I've been going to the same voice coach for years. Would a letter from him be appropriate or do I need to take a random for fun class at the college? I imagine the purpose of this letter is to show that you're well-rounded so I'm not sure if a Certified By Real Professor stamp is needed for that or not.

I'm a post-bacc student who graduated 10 years ago. I have science letters from the post-bacc but haven't taken any non-science classes.