A hum like my grandma's

Winding my way through the little corrals at Barnes and Nobels, I finally found what I was looking for. A cookbook for kids, that I will send to my nephew for Christmas, that didn't have too many sweet things. (This was because the gift is meant for my sis as well as for my nephew.) Because it's the Christmas season, B&N was offering free gift wrap, or if you wanted you could give a donation. An elderly man in a cap and an elderly woman sat at a table. There were some brown skinned space creaters who were splashed across the paper I chose. As the man adjusted the cookbook between the edges of the paper and measured and creased with great precision, he began to hum. It was a hum like my grandma hummed when she was around me. My grandma would sometimes preface her humming this way by saying she didn't know the words to the songs. This made me curious and as I listened to her, I wondered what the songs were. It was a busy hum that she made while she did things, and it wasn't a ho hum hum. It was a hum that moved high and low and would seemed to say that she knew enough about music to want to teach me. I never would have remembered her hum, because I had never heard anyone else make that kind of music. What a wonderful gift to find for myself in Barnes and Nobels. What are the words? Where is the music?