The sister trio appeared on Thursday's episode of the iconic children's show to sing a new tune explaining the ABCs alongside Elmo, Big Bird, Cookie Monster, Burt, Ernie, Oscar the Grouch ...

As a kid, you likely spent a lot of time learning your ABCs from characters like Cookie Monster, Big Bird, Elmo, and Oscar the Grouch. "Sesame Street" has been on the air since 1969, and has ...