Last night, Gustavo Dudamel made his debut as the new music Director of the Los Angeles Philharmonic. Host Fred Child was there, and will share his experience of the big event. We'll hear excerpts from Mahler's first symphony from the concert. Plus, our weekly 21st-century work is a charming string quartet by Paul Moravec called "Vince and Jan: 1945." It's based on a World War II-era photo of Moravec's parents, Vince and Jan (see sidebar at right).