One Day is a song performed by US reggae (雷鬼乐) singer Matisyahu. Reggae is a music genre (流派) that was born in Jamaica in the late 1960s. Through a lovely rhythm (节奏) and positive lyrics (歌词), this song expresses a hope for peace and a wish for an end to violence (暴力). It calls on mutual (相互的) understanding and tells people there are no winners in war. The song was used at the 2010 Winter Olympics.