Solo Song

Right, little problem girls :'(
In music we have to do a solo performence, which would be find, but I have no instrumental talents. I had guitar lessons for three years and can still only play one note. We can go on the keyboards of course, but I'm pretty slow, and seeing that one of the elements we'll be judged on is fluency, it's not looking good. So anyway, I've signed up to sing, because its somrthing I'm pretty confident in doing, but now I don't know what song to  do. If any of my amazing followers can give me some options then I'll write a thank you as one of my posts. I have a very high voice, and tend to listen to indie msic, songs that not everyone will do. I'm also an aspiring rapper, so if you can give me any existing raps ( that are suitable for a school lesson) then that would please me ....Please Comment. Thank-youu beautiful :') xxx