What is an example of an Unconditioned stimulus UCS?

In an example of a boyfriend and girlfriend:

The BF and GF are having a makeout session while listening to Coldplay. The GF has this happy/exciting feeling while making out. Now each time the GF hears Coldplay, she gets excited and happy.

Now to put it in an organized manner:

The CS (Conditioned Stimulus) would be the making out-

The CR (Conditioned Response) would be the happy/exciting feeling.

The UCS (Unconditioned Stimuluts) would be the Coldplay songs/ listening to them-

The UCR ( Unconditioned Response) would also be happy/exciting feeling

( although the UCR would not be as strong as the CR).

Hope this helps.