Need your help

Auditions for music therapy course are coming up in November, which means I really need to start working out and practicing pieces. For Melbourne I have to play 3 pieces, of contrasting styles on my main instrument (piano) so thats no drama, been there and done that many times before! Also, have to improvise on a mood or feeling that they'll suggest on the day- which will be interesting but having majored in composition at uni I should be able to manage that one- anyway it's all creative interpretation!!
But, and this is where I need your help, I also need to play and sing 3 songs on guitar- definately not my best instrument so I really need to get onto it and figure out what songs I'll attempt. Already chosen Ben Harpers 'Waiting on an Angel' which is prob a biased choice as it's a personal fave- but it's also playable so why not! But now I need to choose 2 more. Think I should do an old, sing along classic eg. Love me tender or something Beatles or the Scope clients fave 'I am sailing'. But now I need one more which should be more up beat and recent 'pop' style. Been doing some research listening to the radio and stuff and there's actually alot of piano base songs out there- which for once doesn't help me.
Anyway, it'd be great to hear what songs 'speak' to you and you enjoy (Steph this is your opp to tell me all about Hilary Duff!!) I'd really appreciated it and find it interesting.