Emmet purring when one of us stirs in the bed at night.
The dusty crystalline tinkle of a light snow on pine needles.
The very satisfied kiss my press makes when making an impression on thick cotton paper.
Trains at the end of my street. This sound never gets old.
The moment when my electric kettle just begins to boil.
This short list inspired by a post on the blog Cup of Jo. Be sure to read the comments on the post.