http://ABCmouse.com/LearnMore "The Letter D Song" (See below for lyrics) While watching this music video for "The Letter D Song" with your child, listen carefully to the folk music style and how the singers whistle in the song. Teaching your child to whistle is a fun way to show him or her how easily they can make their own music. About Us: ABCmouse.com is an award-winning website that uses a variety of activities, including these songs, to help children build a strong foundation for futur