The Season 3 opener spotlights American musicals with help from Stephen Sondheim, who shares film of the original Broadway production of "Follies"; Christine Ebersole, who sings classic show tunes; and Angela Lansbury, who reflects on her Broadway career, including her stints in "Mame," "Sweeney Todd" and "Gypsy." Feinstein also discusses his friendship with with Ira Gershwin and performs "Lullaby of Broadway," "Let Me Entertain You" and "No One Is Alone."