What is a name of the 钢琴 song in S6E16 Coda?

Anyone knows ?
I 爱情 this song !
I found link
on youtube.
But still no idea what's the name.

Is it a new song that Criminal Minds team made just for this epi 或者 already existed since long..? 或者 what~~!! want to get an original file.. T_T