Conductor Gustavo Dudamel is riding a wave of Dudamania

The new global poster boy for classical music and his wife are salsa-stepping across the ballroom of the Alba Hotel. Calm, precise and seemingly always sure of their next move, Gustavo Dudamel and Eloisa Maturen grin at each other and the dozens of other couples around them as they execute perfect copas and ‘spot turns.’ Barely two hours earlier, Dudamel, the 27-year-old conducting prodigy who will take over as music director of the Los Angeles Philharmonic in September, was beaming and waving to a packed auditorium after leading the Simon Bolivar Youth Orchestra through a thunderous performance of Tchaikovsky’s Fourth Symphony. The concert last summer, marking the orchestra’s 30th anniversary, was a rousingly nostalgic occasion, with Dudamel’s elderly artistic mentor, Jose Antonio Abreu, joining his protege on stage amid a fusillade of flashing cellphone cameras, air kisses and lusty cheers. Dudamel’s seamless transition from virtuoso black-suited maestro to goodtime party guy speaks volumes about why many in the classical music world believe the L.A. Phil has scored the coup of the decade by signing him to a five-year contract. When the charismatic South American takes over from Esa-Pekka Salonen, who is stepping down after 17 years at the podium to further his composing career, he will bring a rare combination of youth and experience, gravitas and exuberance, old-school European repertory knowledge and a New World willingness to break with fusty practices when necessary.