And here they are at the Tiny Desk: Big Bird, Bert and Ernie, Rosita, Abby Cadabby, and Cookie Monster, all singing about a sunny day and how everything is A-OK. The Sesame Street crew — including Elmo, Grover, and other surprise guests — visited NPR’s headquarters in Washington, D.C., to celebrate Sesame Street’s 50 years of teaching the world its A-B-Cs, its 1-2-3s, how to be kind and how to be proud, all while spreading love and joy.