Barney & Friends (Heard once in "Bunches of Boxes" and "Splish! Splash!".)
Blue's Clues (Heard once in "What Does Blue Need?", "Blue Goes to the Beach", "Magenta Comes Over", "What Experiment Does Blue Want to Try?", "What's That Sound?", "Pool Party" and "Soccer Practice".)
Bubble Guppies (Heard once in "Build Me a Building!" and "Super Shrimptennial! Celebration!" and quadrice in "Fishketball!".)