rin is a bit nasily sounding like she has a cold in this video..rin IS like 14 so her voice isnt deep but isnt loli like either so you can determine yourself how she sounds like.. if you want you can do harmonies to put a little snazz when you sing the chorus.. but when rin and len are singing their own chorus, len has the harmony. 

REMEMBER: The audio you upload here is the audio (if you get chosen) will be the one on the video so make sure you practice :)