I won second at a competion lat year with this song (the person who won first won because it was biased, actually... -.-)
Mean by Taylor Swift. If you've been bullied or teased before this is a good song.
Remember to chose a song that MATCHES YOUR AGE. If you chose a song about divorce and you're 11, that's proooobably not going to go over so well. Try not to chose a song completely based on love, to adults it isn't age appropriate.
Another good song is the classic Over The Rainbow. If you're good at high notes this song is perfect. If you aren't then just practice. You'll get it.
The Climb by Miley Cyrus. Yeah, I know, /Miley/. But this was actually sung twice at the competion last year because it was so age appropriate. It has high notes however, but if you can get them, then you're good.
Remember to smile a lot. And don't just stand there. Move around, command people to look at YOU and listen to YOU. Don't be afraid, either. Just have fun with it and have lots of emotion. And most definitely, good luck with X Factor! <3
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Ghosts n' stuff (vocal version)
Artist: deadmau5