We spent a couple days reading a Before Five In a Row book titled, "The Quiet Way Home" by Bonnie Becker. It is a sweet story describing a grandfather and his granddaughter taking "the road less traveled and delight[ing] in [the] small sounds, too good to miss" (summary from manual). All the small sounds are those that are often lost in all the noise of children playing, busy streets, and the hustle n' bustle of life-- sounds such as the bees buzzing, a tricycle wheel creaking, a sprinkler spraying, and a man digging in his garden.
BBC excerpt about how the ear works-- very cool!
As a go-along activity, I put together a Sound Matching Activity. I found some heart shaped boxes at the Dollar Store to use and filled them put different materials-- two hearts had the same item. Without peaking into the hearts, T had to shake them and find the match, only by using his sense of hearing!