Larks trilled unseen above the velvety green fields and the ice-covered stubble-land;
Leo Tolstoy. Anna Karenina (1878)
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Her musical but weak voice died away along the waves, and the winds carried off the trills that Leon heard pass like the flapping of wings about him.
Gustave Flaubert. Madame Bovary
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Usually I'd tickle him as I said the word, sometimes burrowing into his stomach with my head, butting him and saying "snooty-wooty" over and over until his trills of laughter flowed down over me.