Ebony snorting its so funny!
Jada's bark
The funny little noise Diamond makes when she is excited

Rain
Listening to my son play his Acoustic gutiar
My sons and my husbands laughter
Sometimes the plain old sound of silence

I have more also but i will spare you reading them.

*edit*
I have to add the sound of my cat purring it is so soothing to me when a cat purrs.