Good song for talent show?

I've been singing a lot more because I just magically become more confident. I'm looking for a song that can be played on acoustic or piano and everyone will know. They can be difficult on the instruments, but I want something with somewhat easy vocals. A few songs I had in mind were In Over My Head and How to Save a Life by the Fray and Everlong by Foo Fighters. I was wondering if anyone knew of any good songs like this that are easy and well known? I'd appreciate any help! Thanks!

Update : I will be attending a concert next year at the Mandalay Events Center, and I was wondering if there was a 3d/virtual model of the venue so I can see my view of the stage.

• stand/sit straight at all times when singing

• control your breathing (you can look up more about that if you want) always breath from your diagram

• join a choir. If you join a choir you can get help from the teacher plus the people around you

• watch youtube tutorials

• practice pitch on the piano (start with la)

• use the vocal warm up that goes "my mummy makes me munch my mini m&ms on a Monday morning ah-ah" < I wish I could sing that 2 you but look it up on youtube

• practice and research!

Good luck

pro level? for classical, 20ish years is common... but depends how much, and how carefully you practice.
for pop styles, less, but still a LOT more than 6 months!

be patient. if it was easy to do quickly, it wouldnt be impressive.