Vienna-based musician and leading fortepianist of his generationreturns to Camden Opera House, 29 Elm St. Maltz specializes in Viennese Classicism — especially the works of Haydn, Mozart, and Beethoven, performed on the Viennese fortepiano of their time. An esteemed educator, he provides insight on the Viennese sound, culture, philosophies, and performance practices of the Classical era.Tickets are $32 in advance, $36 day-of-show, via camdenoperahouse.com and 236-3154.