Not a full-length musical, but an amazing tour-de-force! James Corden welcomes the stars of “Mary Poppins Returns” to perform a musical-inspired role call, featuring Lin-Manuel Miranda and Emily Blunt singing classics from 22 musicals covering “Evita” to “The Wizard Of Oz.” And Kermit the Frog stops by to help James with ”The Rainbow Connection.” (Posted 12/19/18, length 12:42)