My father was a singer / hummer / whistler during all tasks. Even in the most advanced stages of Alzheimers when he couldn't communicate in words or follow conversation, he kept up the singing as long as possible, then just humming, then just tapping and turning anything and everything into an instrument. Up until within a week of his death, he was doing this. Musical minds are amazing. My son is also a constant singer, hummer, whistler.