For me its this one
Most Helpful Girl
Bring it on Home to Me by Sam Cooke
My mom and I used to bake ALL the time. If we weren't baking, I would do homework at the table while she made dinner or cleaned or basically anything else. Any time this song came on (on her CDs when I was younger or her iPod more recently) we immediately start dancing around and belting the song out. So whenever I hear it I think of my mom and it makes me happy.