音乐 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" 由 Michael Jackson 或者 "Wind of change" 由 Scorpions. Words doesn't meter, I will rewrite them on my language. I ask for 建议 - which amazing songs do 你 know? Beautiful melodies, not fast.. I need your help!