Simple. Just write what it is and by who and maybe why, if you want to.
Mine is "Right Here Waiting" by Richard Marx
It's a long story how I came to this song but I'll try to make it as short as possible.
One of my ex girlfriends (she was my girlfriend at that time) told me to check out the BGMs of Vampires Dawn (she loved the game as well as Vampires Dawn 2) and there was this one midi that sounded so similiar. Instant love for that song.
After some months my girlfriend left me due lack of "time" (..bla bla bla and so on)
I've played the song over and over untill my father came into my room and asked me if I know who made the song.
I said that I don't know who and he told me that it is "Right Here Waiting" by Richard Marx.
I still listen to that song to remember the awesome times with my first girlfriend that had interests in gaming.. ah yeah, good times.. *sniff*