Someday or One Day这首歌是《想见你》电视剧的片头曲，由孙盛希演唱。
歌曲节奏轻快，但又饱含着对心中的他的想念。音符奏起就把观众带入剧情中，把观众引入剧情。有许多观众也是因为音乐才追着这部剧。
《想见你》不同于以往的台湾无脑爱情剧，这部剧使用了双向的叙事手法。每集的结尾部分都是反转，让观众想不到接下来的剧情走向。明明是不同时空的四个人，却因为一场谋杀意外带来的穿越而联系在一起。在两个空间的维度之下，两段相同长相、不同身份的人物的爱情故事的发生。
Someday or One Day歌词：
Sunset fades away
Streetlights start to blaze
A turntable corner café
As evening fades to gray
Red brick alleyways
Winding like a maze
These memories rewind replay
And I am faraway
He said to me that one day
He'd meet me by the Milky Way
Impossible to stay away
Impossible to stay
But please tell me that someday
One day
Played this song for days
Wandering in a haze
Soundtrack turned up all the way
A smile to end the day
He said to me that one day
He'd meet me by the Milky Way
Impossible to stay away
Impossible to stay
You'll be back to me someday
One day
He said to me that one day
He'd meet me by the Milky Way
Impossible to stay away
Impossible to stay
But please tell me that someday
Please tell me that someday
You'll be back to me someday
One day
虫儿飞钢琴谱 黑黑的天空低垂，亮亮的繁星相随
SomedayMyPrinceWillCome钢琴谱-AdrianaCaselotti-白雪公主和七个小矮人OST
Someday I Meet You钢琴谱-為妳而舞
Some day钢琴谱-Nickelback
Someday my prince will come钢琴谱-独奏-菅野よう子
Someday My Prince Will Come钢琴谱-独奏-thisisit2009
someday my prince will come钢琴谱-thisisit2009
Someday My Prince Will Come钢琴谱-王滨版-Barbra Streisand
Someday钢琴谱-Dream High OST-李智恩
Someday My Prince Will Come钢琴简谱-数字双手-Adriana Caselotti
一笑江湖钢琴谱-闻人听书
记忆深处钢琴谱-朴正元
如果能在一起钢琴谱-梁静茹
Suspirium钢琴谱-Thom Yorke
Pink White钢琴谱-Frank Ocean
英雄落幕钢琴谱-燃烧的音符
轻漪的节音钢琴谱-HOYO-MiX
迷宫钢琴谱-七朵花
Benedictus钢琴谱-Karl Jenkins
Everything Stays钢琴谱-Rebecca Sugar
Green Hill Zone钢琴谱-中村正人
I Like You So Much Youll Know It钢琴谱-Ysabelle Cuevas
Eyes On Me钢琴谱-植松伸夫 王菲
Lavenders Blue钢琴谱-民谣
游吟诗人言和钢琴谱-燃烧的音符