Yates walked merrily down the road, whistling "Gayly the troubadour."
I hear their groans as they strain, and the whistling of their breath.
She gave an involuntary look at the barn, where David was whistling a merry stave.
He strode away, whistling, and the tune was full of courage and determination.
He was whistling a tune in a wheezy way, and keeping step to it grandly.