Toodlee doo

From OAPedia.com

A "toodlee doo" song is a Muzak-type song performed using a flute. Gray Wolf is known for doing songs like this, and Anthony imitates them with his slide whistle, as well as singing "toodlee doo" along with such songs. For a while, Anthony did a Toodlee Doo Song of the Day. One of the listeners even submitted a toodlee doo version of "Pendulum".