serenade       
 verb [ T ] uk/ˌser.əˈneɪd/ us/ˌser.əˈneɪd/
 (尤指夜间男子在心仪女子的窗外)为…演奏(或演唱)
to play a piece of music or sing for someone, especially for a woman while standing outside her house at night
  Romeo serenades Juliet in the moonlight. 罗密欧在月光下为朱丽叶唱起小夜曲。 
 Shoppers are serenaded with live piano music. 购物者可以欣赏到现场演奏的钢琴曲。 
 serenade         
noun [ C ] uk/ˌser.əˈneɪd/ us/ˌser.əˈneɪd/
 (为某人演唱或演奏的)曲子
a song or piece of music sung or played for someone
  小夜曲
a piece of classical music in several parts
  "Moonlight Serenade" 《月光小夜曲》