música fans, I need your help)

I'm from Latvia. In school we need to present our class song. Something like hymn. I need beautiful melody, which are popular. For example.. "We are the world" por Michael Jackson or "Wind of change" por Scorpions. Words doesn't meter, I will rewrite them on my language. I ask for conselhos - which amazing songs do you know? Beautiful melodies, not fast.. I need your help!