What is the best English pop song that both teachers and kids aged 7-12 like nowadays?

I have to perform for this school and i don't know what song to sing. They want me to sing pop songs like Ke$ha and Taylor Swift and all that stuff. Give me a really darn good song best you give me at least five songs. one of my ideas was make it shine by victoria justice. And those songs must have a karaoke with it on youtube. I need an answer.