New York Philharmonic principal trombone player Joseph Alessi, left, teaches Vietnamese student Pham Manh Tung, right, during a master class at the Vietnam National Academy of Music in Hanoi,Vietnam, Saturday, October 17, 2009. Members of the Philharmonic participate in master classes during their tour in Hanoi. The New York Philharmonic made its debut in Vietnam with concerts at the Hanoi Opera House on Friday, Oct. 16, 2009 and will perform again on Saturday, as part of Asian Horizon tour consisting of 11 concerts, spanning five Asian countries.