NEW YORK (AP) – Leonard Bernstein was as much a teacher as a conductor and composer. Now, his musical grandchildren have taken the stage, and perhaps just in time for classical music.

Last weekend, two young lions of the podium – men about to take on the awesome responsibility of leading orchestras in the nation's two largest cities – paid tribute to Lenny with Carnegie Hall concerts celebrating the late maestro's 90th birthday season.

On Friday, the 41-year-old Alan Gilbert led the New York Philharmonic in a commemoration of the 65th anniversary of Bernstein's first major triumph with the orchestra he went on to lead from 1958 to 1969. On the same stage on November 14, 1943, the 25-year-old Bernstein created a sensation – and front-page news the next day – by filling in for the ailing Bruno Walter in a national radio concert.

On Sunday, the 27-year-old Venezuelan Gustavo Dudamel led the Israel Philharmonic in two works by Bernstein, plus one of Bernstein's favourite symphonies.

It's too bad Bernstein, who died in 1990 at age 72 – wasn't around to witness this juxtaposition of masterful young talent. Gilbert was five when the last of Bernstein's 'Young People's Concerts' was televised in 1972; Dudamel wasn't even born to witness the iconic series that brought classical music to the baby-boom generation.

Gilbert, chief conductor of the Royal Stockholm Philharmonic for the past eight years, is moving from Sweden's east coast to his home town next autumn to become the New York Philharmonic's music director.

Dudamel, who has been music director of the Gothenburg Symphony, goes from Sweden's west coast to the US West Coast to take the same position with the Los Angeles Philharmonic.

They face great challenges – more immediately the haemorrhaging economy and then the aging demographics of the classical music audience.

"I feel optimistic," Gilbert told a small group of journalists last month.

"The thing that has made it possible for me not to dwell on the onerous challenge is the fact that ... I've been asked to be myself. ... I'm idealistic. I do think that essentially all of these things need to flow from the essential quality of the music making and the playing that the orchestra does on stage."

On Friday night, the music flowed with power and sensitivity. Gilbert led an all-Bernstein programme featuring the Symphonic Suite from 'On the Waterfront', 'Serenade (after Plato's Symposium)' with Glenn Dicterow as solo violinist and eight songs from 'West Side Story' with soprano Ana Maria Martinez, tenor Paul Groves and the New York Choral Artists.

'Waterfront' was filled with the violence and romance of Elia Kazan's 1954 movie starring Marlon Brando and Eva Marie Saint in a story about an ex-boxer's fight against union corruption.

Jumping and with big sweeping gestures, Gilbert ratcheted up the tension to near frenzy.

He stabbed the air with his baton during its percussive punches, and when the music got suddenly quiet, he collapsed into a crouch. By the end, his dark straight hair was spiking above his forehead.

Dicterow performed effortlessly in the Serenade, and Groves and Martinez captured the passion of the ill-fated lovers Tony and Maria in the songs.

On Sunday, it was Dudamel's turn to rock.

To his regret, Dudamel never met Bernstein. "I'm very sad because he was a special character," he said in an interview with The Associated Press. "One of the best, if not the best. And he's an inspiration for me. He was a magic man. ... I love to play his music."

The concert began with Dudamel leading a haunting performance of 'Halil', a flute concerto Bernstein finished in 1981 in memory of an Israeli flutist killed in the 1973 war. With its mix of dissonance and tonalism, outbursts and quietude, the music depicts the horrors of war and the craving for peace.

The soloist, Eyal Ein-Habar, played the difficult and almost nonstop part with technical dexterity and great sensitivity.