John Eliot Gardiner, meanwhile, leads the Orchestre Révolutionnaire et Romantique on 19th-century instruments (Philips 289 462 603-2; two CD's).
On June 12, Mr. Salonen leads the Orchestre de Paris in Schoenberg's "Verklärte Nacht" and Mahler's Symphony No. 1 ("The Titan"), and on July 19 "A German Requiem" by Brahms is heard.
Box office: Rossini Opera Festival, 37 Via Rossini, 1100 Pesaro, Italy; (39-721) 30161, fax (39-721) 30979; www.rossinioperafestival.it Luxembourg Festival International Echternach May 11 to July 2 Jean-Claude Casadesus leads the Orchestre de Lille in the Berlioz Requiem, and Thomas Fey conducts the Heidelberg Orchestra in works by Beethoven and Haydn with the cellist Françoise Groben.
On Friday he leads his Petit Orchestre, a chamber group that includes the violist Tanya Kalmanovitch and the trumpeter Herb Robertson; on Sunday he celebrates the release of "Guewel" (Clean Feed), an album inspired by the music of Senegal, with players like the cornetist Taylor Ho Bynum and the French horn player Mark Taylor.
Memories of a previous cycle of these works that Mr. Barenboim led in Carnegie Hall, with the Orchestre de Paris in 1982, are by no means uniformly happy.
The listeners were clearly delighting in the presence of Mr. Nézet-Séguin, their native son, at the helm of the ensemble he had led for 12 years, the Orchestre Métropolitain of Montreal.
It comes from Mr. Maazel's portfolio: he led its world premiere with the Orchestre National de France, and he seemed entirely comfortable with its almost constant changes in balance and texture.
Since 2010, the Orchestre de Paris has been led by Paavo Järvi, the Estonian maestro with the precisely jabbing beat.
He led the Boston Symphony Orchestra (1919 24), Amsterdam Concertgebouw Orchestra (1924 34), Orchestre Symphonique de Paris (1929 38) and San Francisco Symphony (1936 52).
Besides the orchestra, led by Seiji Ozawa, the participants include the tenor Andrea Bocelli, the Orchestre de Paris and a chorus of 600 adults and children.
