Definition of "tootling"

[…] raving through the mad scene in Lucia amid childish orchestral tootlings […]

1894, George Bernard Shaw, “Puccini: Manon Lescaut”, in Louis Crompton, editor, The Great Composers: Reviews and Bombardments by Bernard Shaw‎, Berkeley: University of California Press, published 1978, page 307

Then with melodious tootlings and amidst guttural plaudits, a big white automobile carrying a glitter of uniforms had gone by, driven at a headlong pace.

1918, H. G. Wells, chapter 12, in Joan and Peter‎, London: Cassell, page 491