the likelihood of anyone being identify this song based on the details I am about to give are very low, but I am going to ask it because it is killing me that I cannot remember the name of it.

the only details that I can vaguely remember are.
>it might be the same kind of music genre as bittersweet symphony.
>the song has a part with a piano/violin (I honestly do not even know what instrument it is exactly) that goes like, "dundun, dundun, dundundun."
These details are vague and I do not expect anyone to be able to figure it out, but it is killing me that I cannot remember it (or anything else about the song), and it is one of those songs that when you hear the beat you will know what it is.