“The renowned conductor … got an early break when, as a very young man, he was hired as Claudio Abbado’s assistant at La Scala in Milan. Now Mr. Chailly, 62, is following in the footsteps of Mr. Abbado, who died in 2014, in more ways than one: he became principal conductor at La Scala this year, and on Thursday he was named music director of the Lucerne Festival Orchestra, which Mr. Abbado revived and led for 11 years.”