What is a beautiful but well known song to learn on the piano?

I'm not expert piano player but I do really like playing! And I always kinda wanted to be like in the school talent shows and play the piano but like I have no clue what song I wanna learn :/ I'm ready to give months to it if it takes that long but usually it take not even a month for me to learn a song... So if anyone knows any songs I would greatly appreciate it :) Any song that sounds good on the piano will do :) Thx