Let There Be Peace (on earth)
Peace of the River
Dona Nobis Pacem

There are many listed in teh songbook, Rise up Singing:

Some that might be appropriate are Bashana Haba'ah; Carry It on; Children of Darkness; Deep Blue Sea; Hymn of Nations; Last Night I Had the Strangest Dream; May There Always Be Sunshine; No More Genocide; Peace in the Valley; Peace Is; Song of Peace (Finlandia); Where Have All the Flowers Gone; and a few more.

If you need lyrics,please start a separate thread with the name of the song in the title and we'll do our best.

katlaughing