Just play something that means a lot to you. If they whinge at you, just remind them that any form of music is valid expression, 2 notes or 200 notes. If it means something emotionally, then it is right.
If they dont agree with you on that, then they are quite obviously robots and is that really a course you would want to do?
I have mixed feelings about these courses. I was working in a college over the summer and enrolling people on these courses, I just don't know what it means to say you have done this course? What does it achieve? I don't mean to piss all over your parade, Tom, sorry if I have; I'm just interested to know how other people - people who think differently about it to me

- think?
And, if it helps, I heard some kid's entry piece that he submitted and got accepted into the legendary Berklee college with. It wasn't that good; not to knock the kid but I was expecting Vai style theatrics and it wasn't even technically demanding. So whatever you do, HAVE FUN!