Thaddeus loves to sing. The first and only song he knew for a long time was "This Little Light of Mine." He still often sticks finger in the air, covers it and says "NO!" then waves his finger around in the air again. It's really pretty cute.
He has recently added to his stock of bedtime songs. But, the addition isn't so much a song as a rhyme. He pulls up his shirt, pokes his stomach three times and then blows air in an attempt to get someone to tickle his tummy while saying the following: "X marks the spot with a dot dot dot, three long lines and a question mark, uppity, downditty, all arounditty, a tight squeeze and a cool breeze. Now you've got the sleepies (or shiveries)."
He's also working on "The Wheels on the Bus," "Happy and You Know It," and "Head, Shoulders, Knees & Toes."