Is there any hidden significance to the song at the end o S06E09?

Just before the credits at the end of Castle S06E09 there is this scene:
The look on Becketts face made me think it could have an underlying meaning other than 3XKs return anyway.
Best Answer
As Tom has said, it meant that either:
- 3XK is around.
- It was speculated that the song had a profound meaning to Beckett (related to her marriage / mother) that 3XK knew about.
Unfortunately we never got around to explore these two cases.
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