A new Smithsonian exhibit called "Red, Hot and Blue" salutes American musicals, from both stage and screen. The exhibit features songs and artifacts from the great era of Tin Pan Alley classics and lavishly produced musicals...from Dolly Levi's hat in "Hello, Dolly!" to self-portraits by George and Ira Gershwin and Irving Berlin's piano...and anecdotes about the performers and composers who created some of America's most distinctive music. The opening night party brought out some people with familiar names — Astaire, Gershwin, and Arlen — as they helped celebrate their famous relatives' accomplishments. NPR's Susan Stamberg reports. reports.