Meaningless lyrics

I was cutting the crusts of of Corin's banana bread, despite having told him that this kind of crust tastes the same as the bread, and midway through he started singing:

"Leave the crusts alone, leave the crusts alone, leave the crusts alone..."

I stopped, thinking my point had sunk in. "You do want me to leave the crusts on?"

"No, Apa," he said, laughing. "I was just singing."